Question

Find the third side of triangle if the perimeter of a triangle is 20 m and two of its side are 5 m and 4 m

Answer 1

Answer:

let third side be x

perimeter = 20m

perimeter = sum of all sides

20=5+4+x

20-9=x

x=11

Answer 2

Answer:

Perimeter = sum of all sides

= 1st side + 2nd side + 3rd

side

Let third side be x

A. T. Q

Perimeter of triangle = 4+5+x

20= 9+x

20-9 = x

11= x

Therefore third side = 11 cm