Question

6. Find the third side of the triangle if the perimeter of that triangle is 20 m and
two of its side are 5 m and 4 m.​

Answer 1

Formulae of Perimeter of the triangle is a+b+c

So,

a = 5 cm

b= 4 cm

Let X be c

a+ b+ c = Perimeter

5+4 +x = 20

9 + x =20

x = 20 - 9

x = 11

C = 11 cm

a =5

b=4

c=11

perimeter = 20 cm

Hope this helps you

Answer 2

Answer:

perimeter = 20 m

sides = a,b,c

a= 5 m

b = 4 m

so, perimeter of a triangle = ( sum of all sides)

= a+b+c = 20 m

= 5+4+c = 20 m

= 9+c = 20m

= c = 20-9

= 11 m

the third side of the triangle is 11 m

I hope this will help you.....