Chapter 16. Mensuration of Cylinder


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1 335 Chapter Cylinder: A solid surface generated by a line moving parallel to a fixed line, while its end describes a closed figure in a plane is called a cylinder. A cylinder is the limiting case of prism. If the generating line is perpendicular to the base, the cylinder is called as Right cylinder, otherwise oblique. The line joining the centres of the bases is called the axis of the cylinder. 16. Volume and Surface area of Different Kinds of Cylinders: 1. Right Circular Cylinder: If the base of a right cylinder is a circle, it is called a right circular cylinder. In the right circular cylinder the axis is perpendicular to the base. If r is the radius of the base, h is the height and d is the diameter of the base, then since cylinder is the limiting form of prism, therefore volume and surface area of the cylinder is also calculated by the same formula of prism. (i) Volume of the cylinder = Area of the base x height
2 336 = π r h = π d h 4 (ii) Lateral surface area = Perimeter of the base x height = π r h = π d h (iii) Total surface area = Lateral surface area + Area of bases = π r h + π r = π r(h + r) Example 1: The curved surface of a cylinder is 1000 sq. m. and the diameter of the base is 0m. Find the volume and height of the cylinder. Here d = 0m, r = 10m Since Lateral surface = π r h 1000 = π x 10h h = 15.9 m Volume of the cylinder = π r h = π x 100 x 15.9 = 5000 cu. m. Example : The radius of a right circular cylinder is 5 cm and its height is 15cm. Find its volume, lateral surface and the whole surface area. Here r = 5cm, h = 15cm Volume = π r h = π x 65 x 15 = cu. m. Lateral surface area = π r h = π x 40 x 15 = sq. sm. Total surface area = Lateral surface area + Area of bases = π r h + π r h = π r(r + h) = π x 50(5 + 15) = sq. cm. Hollow Circular Cylinder: The examples of hollow cylinders are pipes and bearing pushes, etc. If R is the outer radius and r is the inner radius of the cylinder, then
3 337 (i) Volume (solid portion) = Volume of external cylinder volume of internal cylinder = π R h π r h = π( R r )h (ii) Lateral surface area = External surface area + Internal surface area = π R h + π r h = π( R + r)h (iii) Total surface area = Lateral area + Areas of solid bases = π(r + r)h + π(r r ) Example 3: Find the weight, lateral surface area and total surface area of iron pipe whose interior and exterior diameters measure 15cm and 17cm respectively, and length 10m; one cubic cm of iron weighting 0.8gm. Here d = 15cm r = 7.5cm D = 17cm R = 8.5cm h = 10cm = 1000cm Volume = π(r r )h = π( )1000 = cu. cm. Weight = Volume x density = x 0.8 = gms Length surface area = π(r + r)h = π( )1000 = π x 16 x 1000 = sq. cm. Total surface area = π(r + r)h + π(r r ) = = sq. cm. Example 4: A well is to be dug 5m inside diameter and 36m in depth; find the quantity of earth to be excavated and the quantity of brick work required for a lining of 5 cm in thickness. h = 36m
4 338 Inside diameter = d = 5m r =.5m Thickness of brick wok = 5cm =.5m Outside diameter = D = = 5.5 R =.75m Quantity of Earth to be excavated = External volume of well = π R h = π x x 36 = cu. m. Brick work = External volume Internal volume = π R h π r h = = cu. m 3. Elliptic Cylinder If the bases of a cylinder are ellipses, it is called on Elliptic cylinder. If a and b are the semimajor and semiminor axes and h is the height, then (i) Volume = Area of the base x height = π a b h (ii) Lateral surface area = Perimeter of the base x height = π (a + b)h (iii) Total surface area = Lateral surface area + area of bases = π (a + h)h + π ab Example 5: In making the pattern of a special container to hold 9 quarter. It is decided to have the bottom an ellipse with axes of 0 cm and 15 cm. Find the height of the container. Here 1 quarter = 1 ton = 1.5kg = 8 Lbs 80 a = 0cm, b = 15cm Volume = 9 quarters = 9 x 1.5 = 11.5 kg = cu. cm. Volume of the container = π a b h = π x 0 x 15 x h h = cm
5 Frustum of a Right Circular Cylinder: When a right circular cylinder is cut by a plane parallel to its base (or perpendicular to its axis) the section of the cylinder is called crosssection, which is a circle. If, however, the plane section is not parallel to the bases i.e., it is oblique, the portion of the cylinder between the plane section and the base is called Frustum of the right circular cylinder. This cutting section is an ellipse. In the Fig.16.5 ACDE represents a frustum of the cylinder whose cutting plane AC is inclined an angleθ to the horizontal. If r is the radius of the base and h a is the average height of the Frustums, then (i) Volume of the Frustum of circular cylinder = Area of base x average height = π r h a (ii) Lateral surface area = Perimeter of the base x average height = π r h a (iii) Total surface area = Area of the base + Area of the ellipse + Lateral surface area For the ellipse, AB = AC Cosθ AB r AB = Cos θ Cos θ So, the semimirror axis = r and the semimajor axis = AB r Cos θ π r Hence area of the ellipse = π a b= Cos θ
6 340 Example 5: A swimming pool is in the form of a cylinder of radius 10m. The depth of the water varies uniformly from 3m at one and end on 6m at the other end. Find how long it will take a pipe to fill it, if the diameter of the pipe is 10cm and the water in it runs at a uniform rate of 4m per second. Radius of pool = 10m 3 6 ha 4.5m Volume of the pool in the form of Frustum = π r h a = π x 100 x 4.5 = cu. m. Diameter of pipe = 10cm Radius = 5cm = 0.05m Length of pipe = 4m Volume of pipe = π r x = π x x 4 = cu. m The quantity of water which the pipe can supply in one second. = cu. m So cu. m of pool fill in time = 1 sec and cu. m of pool fill in time = seconds = 1.5 hours Exercise 16 Q1. The diameter of a right circular cylinder is 38cm and its length is 8cm. Find its volume, lateral surface and total surface. Q. The whole surface of a right circular cylinder is 10 sq.m and the height is three times the radius of the base. Find the radius of the base. Q3. A rectangular piece of iron sheet 1000 sq. cm in area is bent to form a cylinder 31.89cm in diameter. Find the height and volume of this cylinder. Q4. Find the weight of 360m of lead pipe with inside diameter of 1.09cm and outer diameter of 3.09cm. Assume that lead has a density of g/cu. cm. Q5. Find the weight of iron in a pipe whose interior and exterior diameter measure 10cm and 11cm respectively and length 10cm (one cu. cm of iron weighing 0.6 lbs). Q6. A right circular cylinder of radius 3 m and height 7m is forged into a hexagonal prism of side 1m. Find the height of the prism. Q7. A cylindrical water drum has a base of radius 1.m and its height is 3m. How many liters of water will it hold? (1 liter = 1000 cu. cm)
7 341 Q8. The rain that falls on the roof 5m kg 30m is conducted to a cylinder 10m in diameter. How great fall of rain would it take to fill the cylinder to a depth of 6m? Q9. The volume of a cylinder is 5 cu.cm. and height 7 cm. Find its curved surface and total surface area. Q10. A hollow shaft with 5 cm. internal diameter diameter is to have same cross sectional area as a solid shaft of 1cm. diameter. Find the external diameter of shaft. Q11. A boiler contain 400 tubes, each 5m long 10cm. external diameter. Find the heating surface of these tubes. Q.1: 10 cylinderical pillars of a building have to be cleaned. If the diameter of each pillar is 50 cm and the height 4 cm, what will be the cost of cleaning these at the rate of 50 paisa per sq. m? Q.13: A circular metal sheet 30 cm in diameter and 0.5 cm thick is melted and then recast into a cylindrical bar of diameter 5 cm. find the length of bar. Answers 16 Q cu. cm, 3343 sq. cm, 5611 sq. cm Q m Q cu. cm Q kg Q lbs Q m Q liters Q m Q9. 64sq.cm; 490.9sq.cm. Q10. 13cm. Q sq.m Q1. Rs Q13. 9 cm. Summary 1. Volume of cylinder = Area of base x height = π r h. Curved surface area (lateral surface) = Perimeter x height i.e. L.S = π r h 3. Total surface area = Lateral surface + area of two ends = π r h + (π r ) = π r(h + r) 4. Volume of hollow cylinder = π R h π r h i.e. V = π h(r r ) 5. Lateral surface = π (R + r)h 6. Total surface = π (R + r)h + π (R r ) 7. Weight = volume x density i.e. W = vd 8. Elliptic cylinder (A cylinder with a base which is an ellipse) (i) volume = V = π ab h (ii) S = Curved surface area (lateral surface) = π (a + b)h (iii) Total surface area = π (a + b)h + π ab
8 34 Q.1: Q.: Q.3: Q.4: Q.5: Q.6: Q.7: Q.8: Q.9: Define cylinder. Short Questions Find the cost of digging a well 3m in diameter and 4 m in depth at the rate of Rs.10 per cu.m. Define Hollow Circular Cylinder. Define Elliptic cylinder. The cylinder of an air compressor is required to have a working volume of 5 cu.m. if the radius is 5/6 m, what must be the stroke? In a hollow cylinder, the cylinder, the circles of crosssection are concentric. If the internal diameters of these circles be. cm and 3.8 cm respectively and the height be 6.5 cm, find the volume of hollow interior. Write the formula of volume of cylinder if radius is given. Write the formula of volume of hollow circular cylinder. Write the formula of total surface area of cylinder. Q.10: Write formula of volume of elliptic cylinder and total area. Q.11: The diameter of the base of a right circular cylinder is 14 cm and its height is 10 cm. find the volume and surface area of solid cylinder. Q.1: If water flows through a 56 mm diameter pipe at a rate of 3 m/s, what volume of water, in liters, is discharge per minutes. Q.13: Find the diameters of the cylinder given the following. Volume 704 cm 3, height 14 cm Q.14: Find height of cylinder if Volume 58 cm 3, diameter 4 cm Answers Q. RS Q5..9 m Q6. 49 cu.cm. Q7. V = r h. Q8. V = (R r ) h Q9. S = r h + r Q10. V = a b h, S = (a + b) h + a b Q cm Q liters Q13. 8 cm Q14. 4 cm
9 343 Objective Type Exercise Q.1 Each questions has four possible answers. Choose the correct answer and encircle it. 1. Volume of circular cylinder of height h and radius r is (a) π r h () π r h (3) π r h (4) π r h. Lateral surface area of right circular cylinder is (a) π r (b) π r h (c) π r h 3. Volume of hollow cylinder if R and r are external and internal radii respectively is (a) π(r r) (b) π(r r ) (c) π(r r )h (d) π(r r)h 4. Volume of an elliptic cylinder is (a) π ab (b) π ab h (c) π(a + b) h (d) a b h 5. If 0 and 10 are the major and minor axis respectively, then volume of an elliptic cylinder of height 5m (a) 1000π (b) 50π (c) 00π (d) 100π 6. Volume of right circular cylinder of height 10cm and diameter is 4cm (a) 40π (b) 160π (c) 80π (d) 4π Answers Q.1 (1) a () c (3) c (4) b (5) b (6) a
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