Question

9. The angles of a triangle are in the ratio 5:3:7. The triangle is

Answer 1

Step-by-step explanation:

let the angles be 5x,3x,7x

so..5x+3x+7x=180(angle sum property)

=>15x=180

=>x=180/15

=>x=12

so the angle are 5*12=60°

3*12=36°

7*12=84°

Answer 2

Answer:

/_A+/_B+/_C=180°

Step-by-step explanation:

5x+3x+7x=180°

15x=180°=> x=12°

Therefore,

1

5x= 5×12= 60°

3x= 3×12= 36°

7x= 7×12= 84°

Hence, this triangle is an isosceles triangle.