CALCULATING PERIMETER. WHAT IS PERIMETER? Perimeter is the total length or distance around a figure.


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1 CALCULATING PERIMETER WHAT IS PERIMETER? Perimeter is the total length or distance around a figure. HOW DO WE CALCULATE PERIMETER? The formula one can use to calculate perimeter depends on the type of shape it is. 1. Square All 4 sides are equal. Hence, the formula is 4 x ll 2cm 2cm P = 4 x ll = 4 x 2cm = 8cm 2. Rectangle 2 pairs of opposite sides are equal Hence, the formula is 2 x (ll + b) 4cm 1cm P = 2 x (ll + b) = 2 x (4cm + 1cm) = 2 x 5cm = 10cm 3. Irregular Shape As the sides may be different, the formula is simply to add the sides together. 2,5cm 2,5cm 3.5cm P= sum of sides = 2,5cm + 2,5cm + 3,5cm + 2,5cm + + 5cm = 22cm 5cm 2,5cm 1
2 Exercise 1 1. Calculate the perimeter of each of the shapes below: ,5m 1,5m 6m 4m 8m ,87cm 3,4cm 80m 25m 7m 60m 20mm 2,65cm 100m 2. The perimeter of a square is 169cm. What is the length? 3. The perimeter of a rectangle is 55cm. If the length is 15cm, what is the breadth? 4. A swimming pool is 6,5m long and 3,5m wide. The paving around the pool is 1,5m wide. If this entire area is to be fenced off, how much fencing is required? 5. Study the diagram of a piece of farming land below: 29km 24km 6km 23km 34km a. What is the perimeter of the land? b. How long will it take the farmer to drive around the boundary of the land if he travels at an average speed of 40 km/h? c. If the farmer leaves at 09h30, at what time will he complete his drive? 6. A sports field is 200m long and 138m wide. How many times must you jog around the field if you want to jog at least 10km? 2
3 CONCEPT : CALCULATING AREA WHAT IS AREA? Area is the size of a surface that is enclosed by a perimeter or boundary. HOW DO WE CALCULATE AREA OF SQUARES AND RECTANGLES? A 2D shape has 2 dimensions: length and breadth. To determine what the area is, we use the formula: AREA = Length x Breadth The answer will always be a square measurement (e.g. mm 2, cm 2, m 2, km 2 ) Example: = ll x b = 6,5m x 2m = 13m 2 A. HOW DO WE CACULATE THE AREA OF IRREGULAR SHAPES? In the irregular shape, one cannot simply apply the formula A = ll x b as there is more than 1 given length or breadth. Subdivide the shape into squares or rectangles, and then apply the formula to each subdivided shape. Now add the answers together. Area of A = ll x b = 50m x 20m = 1 000m 2 3
4 20 50 A 30 B 25 Area of B = ll x b = 50m x 30m = 1500m 2 Total area: 1 000m m 2 = 2 500m 2 EXERCISE 2 1. Calculate the area of each of the shapes below: All measurements in m. 5, ,
5 2. A home owner wants to carpet her lounge, which is 6,5m long and 4,25m wide. If the carpet company charges R89 per square meter of carpet, how much will she have to pay? 3. Your school needs to acquire new soccer fields. A soccer field is 100m by 50m. If it purchases a square piece of land that has a length of 250m, how many soccer fields can it fit on the land? 4. Study the diagram below: 7m Roses 4m 3m 5m A gardener wants to pave the border around his rose garden. a. How much soil does he need for the rose garden? b. How much paving will he need? 5. Terrence decides to tile his kitchen floor. The floor is 3m long and 2,8m wide. a. How many tiles will he need if each tile measures 20cm x 20cm. b. How much does he have to pay if the tiles cost R491,75 /m 2? 6. If the area of a rectangle is 42cm 2 and its length is 60mm, what is its breadth? 7. I want to purchase a rectangular mirror which is 6m long and 4m wide. The frame around the mirror will extend 1,5m on each side. What is the total area of the frame? 8. The area of a room is 20,65m 2. What is the length of the room if the breadth is 2,4m? 5
6 CONCEPT :AREA OF TRIANGLES Previously, you saw that the formula for the area of a square or rectangle is A = ll x b Now study the diagram below: Can you see that the rectangle can be divided so that 2 identical triangles are formed? What does this tell you about the relationship between the triangles and the rectangle? Do you agree that the rectangle is twice the size of the triangle, or that one triangle is half the size of the rectangle? This means that the area of the triangle is half the area of the rectangle. Hence, to work out the area of triangle, the formula used is ½ x (b x h). Example: A 3m B Area of ACD = ½ x (b x h) = ½ x ( x 3cm) = ½ x 18cm = 9cm D 6m C EXERCISE 3 1. Calculate the area of each of the following triangles: cm 3cm 5cm 3cm 6
7 mm 7m 75mm 27m 2. Base Height Area A 30cm 45cm B 1 80cm 2 C 3,1cm 9,4cm D 12cm
8 CONCEPT : CALCULATING VOLUME DEFINITION OF VOLUME Volume is the amount of space taken up by a 3D object The units of measurement used to calculate volume are mll, ll and cubic measurements (e.g. m 3 ) FORMULA FOR VOLUME 1. A cube or rectangular prism The formula for volume is: V = ll x b x h Example: V = ll x b x h = 18m x 4m x 6m = 192m 3 2. A rightangled triangular prism Step 1: Determine the area of the bottom face of the prism Step 2: Multiply your answer by the height of the prism 3 i.e. 2 V = area x height Area of the triangle = ½ (b x h) = ½ (3cm x 2cm) = ½ of = 3cm 2 Volume = 3 x 3,5cm 3 3,5 = 10,5cm 3 8
9 EXERCISE 4 Calculate the volume of each prism below: 1) 2) 4cm 12cm 3) 4) 3,4m 65mm 4,1m 5mm 7,3m 15mm 5) 6) 32m 2,1km 5km 75m 0,8km 8m 9
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