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Question

ABC is a triangle in which AB = AC. The base BC is produced to D. If ACD = 130, then A = ___.

A

80°

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B

60°

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C

50°

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D

40°

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Solution

The correct option is A

80°


ACD = 130 ........ (given)

ACB =50 ....... (linear pair)

Given that AB = AC

ABC = ACB = 50 ..... (base angles of an isosceles triangle)

Therefore,A + 50° = 130° ..... (exterior angle theorem)

A = 80


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