# Find the radius of the circle:

A piece of string is in the form of a rectangle 8.9 cm long and 5.4 cm broad is reshaped and into the form of a circle.Find the radius of the circle:

- 7.8 cm
- 6 cm
- 4.55 cm
- none of these

**Answer: (3) 4.5 cm **

**Explanation:-**

The length of the rectangle = 9.8 cm

The breadth of the rectangle = 5.4 cm

Then, area of the rectangle = 9.8 x 5.4

= 52.92 cm²

Rectangle reshaped into the form of a circle.

πr² = 52.92

r² = 52.92 x 7/22

r² = 370.65/22

r² = 16.847

Square root on both side,

r = 4.10

Then, the value of the radius is 4.5 cm (Approximately)

Hence, the correct answer is option (3) 4.5 cm