Question

In an isosceles triangle, the measure of base angle is 47°. Find the measure of the vertex angle.

Answer 1

Answer:

86°

Step-by-step explanation:

In an isosceles triangle,

measure of base angle= 47°

We know that in an isosceles triangle measurement of base angle is equal.

By angle sum property of a triangle-

Base angle + base angle + vertex angle = 180°

47° +47°+vertex angle= 180°

94°+ vertex angle = 180°

Vertex angle = 180- 94= 86°

Answer 2

Answer:

Step-by-step explanation:

We know that the sum of all the angle of a triangle is 180

Let the arm of triangle be x

: x+x + 47 =180

X=180-47

=133 / 2