Question

Find the area and perimeter of the circles with following: Radius = 10.5cm

Answer 1

The Area of a Circle with radius r = πr² 
∴ The Area of a Circle with radius 10.5cm 
= π(10.5)²

= `(22)/(7)(10.5)^2`
= 346.5cm²
The Circumference of a Circle with radius r = 2πr
The Circumference of a Circle with radius 10.5
= 2π(10.5)

= `2 xx (22)/(7)(10.5)`
= 66cm.