Question

A circle of radius 10 inches has its center at the vertex C of an equilateral triangle ABC and passes through the other two vertices. The side AC extended through C intersects the circle at D. The number of degrees of angle ADB is:

(a) 15, (b) 30, (c) 60, (d) 90, (e) 120​

Answer 1

Step-by-step explanation:

Angle ABC=60°

angle CAB=60°

angle ABD=90°[angle inside a semicircle is always 90°]

angle ADB=180°-[CAB+ABD]=60°

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