চিত্রে AB = BC = CD = AD এবং∠CBD=30° হলে ∠x এর মান কত?
Solution
Correct Answer: Option C
এখানে, AB=BC=CD=AD
এবং∠CBD=30°
∠ABD=30°
∴ ∠ABC=30°+30°=60°
∴ ∠ADC=60°
তাহলে,
∠BAD+∠BCD=360°-(60°+60°)
⇒∠BAD+∠BCD=360°-120°
⇒∠BAD+∠BCD=240°[∠BAD=∠BCD]
⇒∠BAD=120°
⇒ X+X=120°
⇒ 2X=120°
⇒ X = 60°
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