Question

Given O below, if AB and CD are congruent, what is the measure of COD?

Answer 1

option B 70° is the answer.

Explanation:

It is given in a circle with center O.

measure of arc AB = measure of arc CD

(Since both the arcs are congruent)

∠AOB = 70°

so m(arc AB) = 70°

since m(arc AB) = m (arc CD)

So m(arc CD) = 70°

and angle formed at the centre by arc DC = 70°

Therefore, option B 70° is the answer.