Answer:
isosceles triangle
Explanation:
first by using corresponding angle theorem:
<A=<C
<A=50°
then by using exterior angle theorem:
<A+<C=<B(the outer angle)
50°+<C=<B,<B=180°-80°(angle B lies in a staight line)
<B=100°
50°+<C=100°
<C=50°
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