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Given:- angle A = 30°
To find:- angle B and angle AOB
Solution:- since, OA = OB (radii of circle)
therefore, angle B = angle A
( angle opposite to equal side are equal).
hence, angle B = 30°.
In triangle, AOB,
angle( AOB +OBA +OAB) = 180°
(angle sum property).
angle(AOB + 30°+30°) = 180°.
angle AOB + 60°. = 180°.
angle AOB = 180° - 60°.
hence, angle AOB = 120°.
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