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

Dear Student!

@nitish06: Very good! Keep posting!

Let the length of third side of the triangle be *x* cm.

Perimeter of the triangle = 50 cm (Given)

∴ 15 cm + 20 cm + *x* cm = 50 cm

⇒ 35 + *x* = 50

⇒ *x* = 50 – 35 (Transposing 35 to RHS)

⇒ *x* = 15

Thus, the length of third side of the triangle is 15 cm.

Cheers!

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