Question

if one angle of a triangle is 80degree and the other two angle are in the ratio 3: 7

Answer 1

3x+7x-80=180
10x=260
x=26
Thus,3x=26×3=78
7x=7×26=218

Answer 2

Let be the angle are in ratio=3x, 7x
We know sum of all angles of a triangle is 180
So,
7x+3x+80=180 (angle sum property)
10x=180-80
10x=100
x=100/10
x=10
Therefore putting value of x in 3x and 7x
3x=3*10=30
7x=7*10=70
So other two angles are 30 and 70.
Hope u understand