Question

Find the area and perimeter of the circles with following: Diameter = 35cm

Answer 1

The radius of a Circle with diameter d is r = `"d"/(2)`
The Area of a Circle with radius r = πr² 

The radius of a Circle with diameter 35 is r

= `(35)/(2)`
= 17.5cm
The Area of a Circle with radius r 
 = π(17.5)²

= `(22)/(7) xx (17.5)^2`
= 962.5cm²
The Circumference of a Circle with diameter d is  πd
The Circumference of a Circle with diameter 35 is π x 35

= `(22)/(7) xx 35`
= 110cm.