Question

Calculate the perimeter of a circle of radius 90 meters​

Answer 1

The circumference of a circle with radius 90 is 565.56

Formulas:

`C=2*\pi *r`.

`C=\pi *d`

`C=√(4*\pi *A)`

`\pi =3.1415`

`A=`
`area`
`of`
`a`
`circle`

`C=circumference` or
`perimeter`

`r=radius,d=diameter`

Step-by-step Solution:

Circumference of a cicle in terms of radius:

Circumference
`=2*\pi*r=2*3.`
`14*90=565.56`

In terms of diameter:

Circumference
`=\pi*d=3.14*180=565.2`

In terms of area:

Circumference
`C=√(4*\pi*A)=√(4*\pi*25450) =565.56`

Note: for simplicity, the operations above were rounded to 2 decimal places and π was rounded to 3.14.

A circumference of 565.5 meters is equal to:

• 0.5655 kilometers (km)
• 56550 centimeters (cm)
• 565500 millimeters (mm)
• 0.351385 miles (mi)
• 618.438 yards (yd)
• 1855.31 feet (ft)
• 22263.8 inches (in)

Answer 2

We Know,

`\:\mathsf{Perimeter\: of\: circle\: = 2πr}`

We are given with radius of the circle i.e. 90 m

Now,

Perimeter of circle = 2πr

= 2(3.14)(90)

= 565.2 m²

Hope this helps you!