Mathematics
ABCD is a rhombus. If ∠A = 70°, then ∠CDB will be :
45°
65°
55°
75°
Rectilinear Figures
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Answer

The sum of consecutive angles in a rhombus is 180°.
∠A + ∠D = 180°
70° + ∠D = 180°
∠D = 180° - 70°
∠D = 110°.
The diagonal BD bisects ∠D.
∠CDB =
∠CDB =
∠CDB = 55°.
Hence, option 3 is the correct option.
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