Zain draws a line segment AB. Then, taking A as the center and AB as the radius, he draws a semicircle above AB. Taking the same radius and B as the center, he draws a curve that intersects the semicircle. From the point of intersection, with the same radius, he draws a curve that intersects the semicircle at another place and marks it as C. What is the angle formed by ABC?

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Solution

Zain draws a line segment AB. Then, taking A as the center and AB as the radius, he draws a semicircle above AB.

Taking the same radius and B as the center, he draws a curve that intersects the another curve.

From the point of intersection, with the same radius, he draws a curve that intersects the semicircle in another place and marks it as C.

Therefore, the angle formed by ABC is $120^{\circ}$ .

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