Question

Find angle 'a'
Solve this question

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Answer 1

Hope it is helpful .............

Answer 2

Answer:

<A=20

Step-by-step explanation:

Given:AB=AC , BC produce D and <ACD=100°

to find <A

Solution:AB=AC (given)

BC produce D so,<ACD=100°

BD is a linear pair so,

<ACB+<ACD=180°

<ACB+100°=180°

<ACB=80°

<C=<B ( by isoscelen property )

<A+<B+<C=180°

<A+80°+80°=180°

<A+160°=108°

<A=20°