Question

a metal wire is shaped in the form of a rectangle.length= 7 cm and breadth= 4 cm.same wire is formed into circle.
find the area of the circle​

Answer 1

Answer:

Perimeter of a rectangle= perimeter of a circle

2(l+b) = 2πr

2(7+4) = 2 × 22/7 × r

2(11) / 2 = 22/7 × r

11 = 22/7 × r

11 × 7/22 = r

3.5cm = r

Area of a circle = πr²

= 22/7 × (3.5)²

= 22/7 × 12.25

= 38.5cm²