Question

Two sides of a triangle are 12cm and 15cm.if the perimeter of the triangle is 40cm,find the third side.​

Answer 1

Answer:

3 cm

as we know that sum of three side of a triangle is its perimeter..So 40-(12+15)=3

Answer 2

Answer:

13 cm

Step-by-step explanation:

first side=12cm

second side=15 cm

let the third side =x

perimeter=40cm

formula = A+B+C =40 cm

=12 cm+15 cm + x =40 cm

27cm + x = 40 cm

x = 40 cm - 27 cm

x= 13 cm

the third side =13 cm