Bunuel wrote:

In the circle above with center O, x =

(A) 60

(B) 50

(C) 45

(D) 30

(E) 20

Attachment:

2017-11-16_1237_002.png

Two sides of the triangle are radii, hence of equal length.

The \(x\) close to the edge of the circle is opposite from a radius. The unmarked angle is also opposite from a radius. Angles opposite equal sides are equal. So all three angles = x

3x = 180

x = 60

Answer A

_________________

In the depths of winter, I finally learned

that within me there lay an invincible summer.

-- Albert Camus, "Return to Tipasa"