Question

One of the
two equal angle of an isosceles triangle is 70degree. Find the third angle

Answer 1

Answer:40°

Step-by-step explanation:

Angle sum property of a triangle equal to 180

Therefore in the triangle there are two same angles since it is a isosceles triangle

Therefore angle x + angle y + angle z is equal to 180

Since X and y have the same value

Angle x +angle X + angle z is equal to 180_________(equation 1)

Given equal angles is equal to 70

From equation 1

2 angle x +angle z is equal to 180

2*70 + angle z =180

140+angle z = 180

Angle z =40

Hence the third angle measures 40°

Answer 2

third angle=40°


70°+70°+x=180°
140°+x=180°
x=180°-140°
x=40°