In the given figure ABCD is a rhombus, the value of x is.
Explanation:
In a rhombus opposite angles are equal and adjacent angles are complementary while diagonals bisect respective angles.
∴ ∠DAC = 40° ⇒ ∠DAB = 80° ⇒ ∠ADC = 180° - 80° = 100°
⇒ ∠BDC = 1/2 × 100° = 50°
Hence, option (b).
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