Question

In ABC, BC = AB and angel B = 100 degree. then angle A is equal to?​

Answer 1

Answer:

80 degree.

Step-by-step explanation:

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Answer 2

Answer:

A=40°

Step-by-Step:

Make an Altitude and name it BP,

The Altitude divides the triangle into two different triangles : Triangle APB And Triangle BPC

TAKE TRIANGLE APB,

ANGLE ABP = 50°

ANGLE BPA = 90°

By angle sum,

50° + 90° = 140°

So, Angle BAP = 180°-140°

= 40°