Question

3)In a triangle ABC,if AB=AC and angle A=70°Find

angle B and angle c.​

Answer 1

Answer:

given :

in triangle ABC ,

AB = AC

this means it is a isosceles triangle ,

it means that angle B = angle C

angle A = 70

to find:

angle B and angle C

let angle B and c be y and y

by angle sum property ,

sum of all angles of triangle = 180°

y + y + 70 = 180°

2y = 180-70

2y = 110

y = 110/2

y = 55.

therefore angle B and angle C are 55 and 55 respectively.