Year 10 Term 1 Homework
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1 Yimin Math Centre Year 10 Term 1 Homework Student Name: Grade: Date: Score: Table of contents 10 Year 10 Term 1 Week 10 Homework Deductive geometry Basic properties of geometry Polygons Deductive proofs involving angles Miscellaneous exercises This edition was printed on March 25, Camera ready copy was prepared with the L A TEX2e typesetting system. Year 10 Term 1 Homework
2 Year 10 Term 1 Week 10 Homework Page 1 of 9 10 Year 10 Term 1 Week 10 Homework 10.1 Deductive geometry Basic properties of geometry Adjacent angles: have a common vertex have a common ray lie on opposite sides of this common ray. Complementary angles have a sum of 90. Supplementary angles have a sum of 180. Angles at a point have a sum of 360. Vertically opposite angles are equal. Parallel lines: Angle sum of a triangle is 180. The exterior angle of a triangle is equal to the sum of the two interior opposite angles. Some other properties of triangles: In a equilateral triangle all angles are 60 In an isosceles triangle, the equal angles are opposite the equal sides. In any triangle, the longest side is opposite the largest angle and the shortest side is opposite the smallest angle. The angle sum if a quadrilateral is 360 Exercise Find the value of x in each of these, giving reasons.
3 Year 10 Term 1 Week 10 Homework Page 2 of Polygons The sum S of the interior angles of any n-sided polygon is given by S = (n 2) The sum S of the exterior angles of any convex polygon is 360 In any regular n-sided convex polygon: each interior angle measures 180 (n 2) n each exterior angle measures 360 n Exercise How many sides have each polygon? 1. decagon 2. nonagon 3. dodecagon 4. heptagon 5. undecagon Exercise Find the sizes of the interior and exterior angles of the following regular polygons: 1. hexagon 2. pentagon 3. dodecagon
4 Year 10 Term 1 Week 10 Homework Page 3 of Deductive proofs involving angles Exercise Given that BA DE. Prove that BCD = ABC + CDE. 2. Given that AB CD EF. Prove that α = β + γ. 3. WX UY ZV and UY bisects T UV. Prove that T W X = UV Z 4. CD EF and GH DJ. Prove that CHG = JIF.
5 Year 10 Term 1 Week 10 Homework Page 4 of Miscellaneous exercises Exercise Find the interior angle sum of a regular polygon that has: 1. exterior angles measuring interior angles measuring 156. Exercise In each of the following, ABCD is a rhombus. Find the value of m, giving reasons. Exercise ABCD is a rhombus. DBE = 30. BAC = 36. Find the value of x.
6 Year 10 Term 1 Week 10 Homework Page 5 of 9 Exercise Find the value of the pronumeral in each of the following, giving reasons: 1. In the diagram. BD = CD, DE AC and CD DF. Find the value of a. 2. In the diagram, AB CD and HG bisects F GD. Find the value of x. 3. In the diagram IJKLM is a regular pentagon. find the value of x.
7 Year 10 Term 1 Week 10 Homework Page 6 of 9 Exercise In P QR, P Q = P R. S is point on PQ such that SR bisects P RQ. Prove that P SR = 3 P RS. 2. In ABC, AC is produced to D. E is a point on AC such that EB bisects ABC. Let ABE = α and BAC = β. (a) Find the expressions for BEC and BCD, giving reasons. (b) Hence, prove that BAC + BCD = 2 BEC.
8 Year 10 Term 1 Week 10 Homework Page 7 of 9 Exercise In the diagram, V W = V Y and UX W Y. Prove that UV Z is isosceles. 2. In ABC, D is a point on AC such that BD bisects ABC. E is a point on BD such that BCE = BAD. Let BAC = α and ABD = β. (a) Explain why BDC = α + β. (b) Hence, prove that CD = CE.
9 Year 10 Term 1 Week 10 Homework Page 8 of 9 Exercise Solve each equation for x: 1. x(x 1)(4x + 1) 2 (x 2 + 1) = 0 2. x 4 64 = 0 3. x 7 3x 5 = 0 4. x 4 4x 2 = (x b) = a + 3
10 Year 10 Term 1 Week 10 Homework Page 9 of 9 Exercise Find the area of the triangle shown below in terms of x and y. 2. Reduce to lowest terms: 2x2 3x 2 10+x 3x 2 3. Rationalise the denominator: Simplify: 1 x x 1 x+1 1 x
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