Question

Calculate the area of circle having diameter as 10 cm?

Answer 1

`"Area"=25picm^2~~78.5cm^2`

Explanation:

`"Area of a circle"=pir^2`

`r=d/2=10/2=5cm`

`"Area"=pi*5^2=25picm^2~~78.5cm^2`

Answer 2

See below...

Explanation:

Area of a circle = `pi*r^2`

Where `r` is the radius.

The radius is half of the diameter.

`therefore r = 10/2 = 5cm`

Area = `pi * 5^2 = 25picm^2`

I'd just leave the answer as an exact value unless specified in the question to a certain accuracy.

Answer 3

`"area "=25pi~~78.54" square cm"`

Explanation:

`"the area of a circle is calculated using"`

`• " area of circle "=pir^2`

`"where r is the radius of the circle"`

`"here "d=10rArrr=10/2=5`

`rArr"area "=pixx5^2=25pi~~78.54" square cm"`