step by step explaination please
figure 9 is a rhombus ABCD in which ABD= 40°. find BAC, BCD , ADC.
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Diagonals of rhombus bisect eachother at right angle
In ∆AOB
angle B + angle O + angle A = 180°
90°+40°+ angle A = 180°
angle A = 180-130 = 50°
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