Question

1 l Find the perimeter of a circle whose area is 154 cm?​

Answer 1

44

Explanation:

The formula to find to area of a circle is
`\pi r^(2)`= Area

The perimiter formula is
`2\pi r` = Perimeter

Since we know the area (154cm) we can find the radius (r) with the formula.

You first have to find what the radius of the circle is with.

`\pi =3.14`

`\pi r^(2)`= 154

3.14
`r^(2)`=154

Now simplify.

`r^(2)`=49 (rounded)

r=7

Now we can find the perimeter with the formula above.

`2\pi r`= P

Now plug in.

2(3.14)(7)= P

44=P (Rounded)