Question

One of the base angles of an isosceles triangle is 70°. The vertical angle of the triangle
(b) 60°
(d) 30
(a) 70°

(c) 40​

Answer 1

Answer:

40

Explanation:

Given the base angle of an isosceles triangles is 700

Let <A=700

Since the triangle is an isosceles triangle,we know that the angles opposite to the equal sides of an isosceles triangle is 1800

<A+<B+<C=1800

700+700+<C=1800

1400+<C=1800

<C=1800−1400

<C=400

Answer 2

Answer:

let a triangle ABC AB=BC

then angle B = angle C

in triangle ABC

angle A + Angle B + angle C =180

angle A + 2angle B =180

2angle B=180-70

2angle B=110

angle B = 55