Question

5. In each of the following figure, O is the centre of the circle. Find the size of each lettered angle.​

Answer 1

Answer:

In the following figure,

O is the centre.

let <A=65°

<B=X

<C =90° ....(by Tangent theorem)

Sum of all angles of a triangle is 180

<A+<B+<C=180

65 + X + 90 = 180

155 + X = 180

X = 180 - 155

X = 25°