Q7 of 30 Page 212

Find the perimeter of a triangle with sides measuring 10 cm, 14 cm and 15 cm.

We know that,

Perimeter of triangle = Sum of the lengths of all sides of the triangle

Perimeter = 10 + 14 + 15

= 39 cm

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5

A rectangle piece of land measures 0.7 km by 0.5 km. Each side is to be fenced with 4 rows of wires. What is the length of the wire needed?

 6

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 and third side 6 cm.

 8

Find the perimeter of a regular hexagon with each side measuring 8 m.

 9

Find the side of the square whose perimeter is 20 m.