Question

7. In the figure O is the centre of the circle What is the measure of ACB?
0) 45°
(1) 60"
(m) 70
(iv) 90°​

Answer 1

Answer:

90°

Step-by-step explanation:

Given: In ΔABC, ∠A = 60° and ∠B = 70°

Using angle sum property:

∠A + ∠B + ∠C = 180°

⇒ 60° + 70° + ∠C = 180°

⇒ 130° + ∠C = 180°

⇒ ∠C = 180° − 130°

= 50°

We know that angle in a semi circle is a right angle.

If AB is the diametre of the circle then ∠C should be equal to 90°.

Hope this will help you.