Question

find each of the two equal angles of an isosceles triangle whose third angel is 80

Answer 1

let each of the equal angles be x.
now, we know that base angles of an isosceles triangle are equal.
then,
2x+80=180 (angle sum property of a triangle)
2x=180-80
2x=100
X=100/2
x=50

hence, the base angles are 50 each