Q. 225.0( 1 Vote )

In the given figu A. 60^o

B. 45^o

C. 30^o

D. 15^o

Answer :

Given: ∠AOC = 120°

Construction: Join OD

We know that,

∠AOC = 2 × ∠ADC

120° = 2 ∠ADC

∠ADC = 60°

Here,

∠ADB = 90° (angle in a semicircle)

∠ADB = ∠ADC + ∠CDB = 90°

∠ADC + ∠CDB = 90°

60° + ∠CDB = 90°

∠CDB = 90° – 60°

∠CDB = 30°

∴ ∠BDC = 30°

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In the given figu A. 60oB. 45oC. 30oD. 15o