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