Question

the semi - perimeter of a triangle whose sides are 20 cm, 15 cm and 9 cm is :​

Answer 1

Answer: 22 cm

Step-by-step explanation:

Perimeter of a triangle = sum of 3 sides

Semi perimeter = (sum of 3 sides )/ 2

So (20+15+9)/2

44/2

= 22 cm

Answer 2

Answer:

Semi - Perimeter = 22 cm

Step-by-step explanation:

Given a Triangle with sides

Side 1 = 20 cm

Side 2 = 15 cm

Side 3 = 9 cm

Perimeter of Triangle = Side 1 + Side 2 + Side 3

=> Perimeter of Triangle =  20 + 15 + 9

=> Perimeter of Triangle =  44 cm

Semi - Perimeter denoted by s  used in heron formula

Semi - Perimeter = (Side 1 + Side 2 + Side 3)/2

=> Semi - Perimeter = 44/2

=> Semi - Perimeter = 22 cm