Write in one word or one sentence answer : 7) ln triangle ABC if AB = BC and <B = 80° then find the measure of <A.
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1
Answer:
50°
A + B + C = 180°
x + 80° + x = 180°
2x = 180° - 80°
2x = 100°
x = 100/2 = 50°
Answered by
1
If AB=BC then it is isoceles triangle.In isoceles triangle opposite angles are equal.Therefore angle B=80°.By using sum of three angles of triangle formulae we get angle A=20°.
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