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Self Practice 8.3a (b) Corresponding angles; 3. x = 125°, y = 100°
∠a = ∠b 4. (a) ∠QOR
1. (a)
(b) ∠TOU
c
d 5. (a) x = 70°, y = 48°
a (b) 250°
b (c) 70°
(c) Alternate angles; ∠a = ∠b 6. x = 33°, y = 58°
(b) Let’s Practise
b c a
d 1. x = 65°, y = 118°
2. x = 60°, y = 84°
(d) Corresponding angles; 3. C
(c) ∠a = ∠b 5 cm
a
c 60°
b
d A 8 cm B

2. (a) 4. x = 139°, y = 94°

c a b q 5. x = 72°, y = 108°
2. (a) r 6. (a) x = 75°, y = 45°
p (b)
A B S R
P Q (b) p a r 6 cm
p r b q
(b) P A B c 105° 120°
P 4 cm Q
A
Self Practice 8.3c 7. x = 64°, y = 32°
1. (a) Parallel 8. x = 72°, y = 120°, z = 60°
B
Q (b) Parallel 9. x = 90°, y = 52°
(c) Not parallel
10. (a) 46° (b) 42°
(c) P Self Practice 8.3d
A Chapter 9 Basic Polygons
1. a = 76°, b = 70°, c = 70°, d = 70°
2. a = 67°, b = 42° Self Practice 9.1a
A
Q B Self Practice 8.3e 1. (a) Number of vertices: 6
B 1. Aeroplane Number of diagonals: 9
(b) Number of vertices: 9
3. (a) Yes Jasni a Number of diagonals: 27
(b) Yes b (c) Number of vertices: 12
(c) No Number of diagonals: 54
Rock (d) Number of vertices: 20
Self Practice 8.3b Number of diagonals: 170
1. (a) Interior angles; Self Practice 8.3f Self Practice 9.1b
∠a + ∠b = 180° 1. (a) x = 117°, y = 88° 1. (a) A
(b) 88°
a c d Mastery 8.3 E B
b
1. x = 45°, y = 93° D C
2. x = 106°, y = 58° Pentagon ABCDE

318
Answers

14 Ans Math F1.indd 318 11/10/16 12:23 PM