Question

5. In a triangle ABC, if AB= BC and B=70°, then find the measure of A​

Answer 1

Answer:

angle A = 55 degree is the answer

Answer 2

Step-by-step explanation:

Given, In triangle ABC

AB=BC

angle B= 70°

Solution-

In triangle ABC,

AB=BC----------(given)

therefore, Triangle ABC is isosceles triangle

angle B=angle C = 70° ---- Isosceles

triangle theorem

angle A+angle B+ angle C = 180°

( sum of measure of all angle of

triangle is 180°)

angle A +70°+70° = 180°

angle A + 140° = 180°

angle A = 180°-140°

angle A = 40°

therefore angle A = 40°

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