Question

The sides of a triangle are in the ratio 3:5:7 and ita perimeter is 45 cm. wht are the lengths of the sides?​

Answer 1

ratio of sides = 3: 5 : 7

sum of sides = perimeter

3x +5x + 7x = 45

15 x = 45

x = 45 / 15

= 3

sides

3x = 3 × 3 = 9 cm

5 x = 5 × 3 = 15 cm

7x = 7 × 3 = 21 cm

Answer 2

A+B+C = Perimeter

LET THE RATIO BE X

3x+5x+7x = 45

15x = 45

x = 45/15

x = 3

Sides

1. 3x = 3×3 = 9

2. 5x = 5×3 = 15

3. 7x = 7× 3 = 21