Q4 of 131 Page 226

A wire is bent to form a square of side 22 cm. If the wire is rebent to form a circle, its radius is

Given, side of square = 22cm

Perimeter of square and circumference of the circle are equal, because the wire has same length.

Perimeter of square = circumference of circle

⇒ So radius is 14cm

A rectangular piece of dimensions 3 cm × 2 cm was cut from a rectangular sheet of paper of dimensions 6 cm × 5 cm (Fig. 9.14).

Area of remaining sheet of paper is

36 unit squares are joined to form a rectangle with the least perimeter. Perimeter of the rectangle is

Area of the circle obtained in Question 4 is

Area of a rectangle and the area of a circle are equal. If the dimensions of the rectangle are 14cm × 11 cm, then radius of the circle is