ANSWERS/HINTS 339
File Name : C:\Computer Station\Maths-IX\Chapter\Answers (16–12–2005) PM65
EXERCISE 10.5
1. 45° 2. 150°, 30° 3.10°
- 80° 5. 110° 6.✂ BCD = 80° and ✂ ECD = 50°
- Draw perpendiculars AM and BN on CD (AB || CD and AB < CD). Show
☎ AMD ✝^ ☎ BNC. This gives ✂ C = ✂ D and, therefore, ✂ A + ✂ C = 180°.
EXERCISE 10.6 (Optional)
- Let O be the centre of the circle. Then perpendicular bisector of both the chords will
be same and passes through O. Let r be the radius, then r^2 =