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1. Consider ΔABD such that angle ADB=20°and C is a point on BD such that AB=AC and CD=CA. Then the measure of angle ABC is-
- A. 30°
- B. 30°
- C. 30°
- D. 30°
Answer: Option B
Explanation:
∠ABD = 20°
So , ∠CAD = 20°
∠ACD = 180° - 40° = 140°
∠ACB = 180° - 140° = 40 °
∠ABC = ∠ACB = 40°...
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