Question

the scalene triangle has 40cm as its perimeter and whose two sides are 13cm and cm find the third side​

Answer 1

You forgot to write 2nd side

Answer 2

The third side of an  isosceles triangle = 14 cm

Step-by-step explanation:

The question:

The isosceles triangle has 40 cm as its perimeter and whose two sides are 13cm and cm find, the third side.

Given,

The perimeter of an isosceles triangle = 40 cm and

Two equal sides of an isosceles triangle(a) = 13

To find, the third side(unequal side), b = ?

We know that,

The perimeter of an isosceles triangle = 2a + b

∴ 2(13 cm) + b = 40 cm

⇒ 26 cm + b = 40 cm

⇒ b = 40 cm - 26 cm = 14 cm

∴ The third side of an  isosceles triangle = 14 cm

Thus, the third side of an  isosceles triangle is 14 cm.