Question

if the angles of a triangle are in the ratio 9:7:5, how big is the largest angle?

 

Answer 1

The angles of triangle are in ratio 9:7:5

We know that sum of 3 angle of triangle is 180.

Here 9x,7x,5x represents  angles of triangle.

9x+7x+5x = 180

21x = 180

x = 180/21 = 8.57

first angle of triangle is 9*8.57 = 77.14

second angle of triangle = 7*8.57 = 60

third angle of triangle = 5*8.57 = 42.85

In given triangle largest angle is 77.14