Find the perimeter of each of the following shapes:
(a) A triangle of sides 3 cm, 4 cm and 5 cm.
(b) An equilateral triangle of side 9 cm.
(c) An isosceles triangle with equal sides 8 cm each and third side 6 cm.
Answer (a)
Perimeter of triangle = sum of lengths of all the sides = 3 cm + 4 cm + 5 cm = 12 cm
Answer (b)
All the sides of an equilateral triangle are equal. Perimeter of an equilateral triangle of side 9 cm = 9 cm + 9 cm + 9 cm = 27 cm
Answer (c)
Perimeter of an isosceles triangle with equal sides 8 cm each and third side equal to 6 cm = 8 cm + 8 cm + 6 cm
= 22 cm
Leave a Reply