Question

A circle has an area of 3.14 cm^2 . What is its radius?

1cm
2cm
1/2cm
cant be detemined

Answer 1

Cant be determined

Explanation:

You would need the diameter to figure this out

Answer 2

The radius of the circle is 1 cm, if the circle has an area of 3.14
`cm^(2)`.

Explanation:

The given is,

Area of the circle is 3.14
`cm^(2)`,

Step:1

The formula for Area of circle,

A = π
`r^(2)`....................(1)

where,

π - 3.14

r - Radius of circle

Step:2

From the given,

Area, A = 3.14
`cm^(2)`

Eqn (1) becomes,

3.14 = 3.14 ×
`r^(2)` (∵ π = 3.14 )

`(3.14)/(3.14)` =
`r^(2)`

`r^(2)` = 1

r =
`√(1)`

= 1

r = 1 cm

Radius of circle, r = 1 cm

Result:

Thus the radius of the circle is 1 cm, if the area of circle is 3.14
`cm^(2)`.