Question

plz answer its urgent​

Answer 1

Answer:

80°

Step-by-step explanation:

In triangle ABC,

If AB=BC then it means that triangle ABC is Isosceles triangle

In an Isosceles triangle,The angles opposite to the equal sides are equal

Hence, If AB=BC, then angle A=angle B =80°

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Answer 2

Answer:

50°

Step-by-step explanation:

Because, AB=BC

Therefore, /A = /C (Angles adjecent to eqaul sides of a triangle are equal)

Now, /A + /B + /C = 180° (Angle Sum Property of a Triangle)

=> /A + 80° + /A = 180°

=> 2 /A = 180°- 80°

=> 2 /A = 100°

=> /A = 100° \ 2

=> /A = 50°

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