Question

The area of a circle with radius r is given by A = π r2. Find the area of a circle with radius 7 centimeters. Use 3.14 for π.

Answer 1

`43.96 cm^(2)`

Explanation:

So we have the radius (r)

r = 7 cm

We have the area formula,

`A=2\pi r`

Substitute,

`A=2(3.14)(7)\\A=6.28(7)\\\\A=43.96 cm^(2)`

Answer 2

The area is 0.015m²

Explanation:

Step one

Given that the expression for area of the circle is A = π r²

Step two

Now our raduis r= 7cm - - - meter =7/100= 0.07

And Pi = 3.142

Step three

Substituting r in the formula for area we have

A= 3.142*(0.07)²

A=3.142*0.0049

A= 0.015m²