Question

4) The perimeter of a triangle is 68 cm. If two of its sides are 22 cm and 20 cm, find the
length of its third side.​

Answer 1

Answer:

perimeter=63

a+b+c=63 ( sum of all sides = perimeter of triangle

22+20+c=63

42+c=63

c=63-42

c=21cm i.e third side = 21cm

Answer 2

Given:-

perimeter = 68 cm

a = 22 cm

b = 20 cm

c = ?

We know that:-

Perimeter of a triangle = a + b + c

68 = 22 + 20 + c

68 = 42 + c

c = 68 - 42

c = 26 cm

Therefore, the required third side of the triangle is 26 cm.