Question

find <A in the figure if AOB is diameter <B=40

Answer 1

angle a is 50 degree

Answer 2

angle B = 40

angle C =90° (because angle subtended from the diameter is always 90°)

By angle sum property of triangle:
angle A + angle B + angle C = 180°

angle A + 40 + 90 = 180°
angle A = 180 - (90+40)
= 180 - 130
=50°

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