Question

find X in the following figure​

Answer 1

B=C ( equal side )

B=40

now

A+B+C=180°

A+40°+40°=180°

A+80°=180°

A=180°-80°

A=100°

Answer 2

Step-by-step explanation:

as we know that if a triangle is isosceles then it below angle will be same then

ang. ABC=ang.ACB

as we know that sum of all angle in triangle is 180° then,

In triangle ABC

ang. ABC+ang.ACB+ang.BAC=180

{given ACB=40°}

40+40+ang.BAC=180

ang. BAC=180-80

ang. BAC=100=x

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