Question

In ∆ABC , AB=AC and angle B = 50° then angle A = ?
a). 40°
b). 50°
c). 80°
d). 130°​

Answer 1

Answer:

Angle A=80°

Step-by-step explanation:

AB=AC

Angle B=AngleC

A+B+C=180

A=180-50-50(B=C)

A=80°

Answer 2

Step-by-step explanation:

Given: AB =AC

therefore : angle b = angel c by isosceles triangle property

Now angel b = angle c = 50

so angle A + B +C =180 by angle sum property

$50 + 50 + a = 180 \\ 100 + a = 180 \\ a = 80$

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