Question

Radius of a circle wirh an area of 12.56mm squared is multiplied by 5 what is the area of the new circle

Answer 1

New area of the circle is 314
`mm^(2)`.

Explanation:

Area of a circle is
`\pi r^(2)`.

Let the radius of the original circle be x.

`\pi x^(2)`=12.56
`mm^(2)`

Now, the radius is changed to 5x.

New area =
`\pi (5x)^(2)`= 25 x
`\pi x^(2)`.

New area= 12.56 x 25= 314
`mm^(2)`

New area of the circle is 314
`mm^(2)`.