Question

0 is the center of the circle. If angle acb is 30 degree then find angle abc?

Answer 1

there is a formula that any triangle which is formed on the diameter of a circle and it's one
vertex touches the circle then the angle of that vortex will be 90 degree .
so, acb=30°
cab=90°
thus,acb=180-90-30
=60° ans
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