Question

the perimeter of a triangle is 50 cm if two of its side is 15 cm and 20 cm what will be the third side​

Answer 1

15cm is the answer
.
. . 15+20+x=50
= 35+x=50
=x=50-35
=x=15

Answer 2

Correct Question

Two sides of a triangle are 15 cm and 20 cm. The perimeter of the triangle is 50 cm. What is the third side?

Solution

→ First side of triangle = 15 cm

→ Second side of triangle = 20 cm

In order to find the length of third side

We know that perimeter of a triangle is the sum of all three sides of a triangle

So the length of third side = perimeter of triangle – sum of length of other two sides

By substituting the values

→ Length of third side = 50 – (15 + 20) = 15 cm.

∴ Hence, the length of third side is 15 cm.