Question

Find the angle is in the following
120
Ost 10
70​

Answer 1

Answer:

the given figure, O is the centre of a circle, AB is a chord and AT is the tangent at A. If ∠AOB = 100°, then calculate ∠BAT. (2011D)

Important Questions for Class 10 Maths Chapter 10 Circles 1

Solution:

Important Questions for Class 10 Maths Chapter 10 Circles 2

∠1 = ∠2

∠1 + ∠2 + 100° = 180°

∠1 + ∠1 = 80°

⇒ 2∠1 = 80°

⇒ ∠1 = 40°

∠1 + ∠BAT = 90°

∠BAT = 90° – 40° = 50°