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In a rhombus ABCD, ABC -40°
Find the other angles.
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Answer:
ABCD is a rhombus
∠C = 70
∘
But ∠A = ∠C =70
∘
∴ ∠A =70
∘
∠A +∠B = 180
∘
(adjacent angles)
70
∘
+ ∠B = 180
∘
∠B = 180
∘
- 70
∘
= 110
∘
∠B = ∠D = 110
∘
∠A = 70
∘
∠B = 110
∘
∠D = 110
∘
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