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1.
△ABC, AB =AC, ∠A=80° ∠B=?
- A. 60°
- B. 60°
- C. 60°
- D. 60°
Answer: Option C
Explanation:
In △ABC,
∠ABC=∠ACB ( Equal sides AB=AC have equal opposite angles)
∠A+∠B+∠C=180o (Sum of all theinterior angles of a triangle is 180o
⇒800+2∠B=180o [As ∠A=80o]
⇒∠B=50o
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