Question

A carpenter is making a tabletop with circumference 4.5m. What is the radius of the tabletop in cm?

Answer 1

The radius of the tabletop in cm is 72 cm (approximately).

Explanation:

Given:

Circumference of tabletop is 4.5m.

So, to get the radius in cm.

Now, we convert the unit of circumference from m to cm.

( 1m = 100 cm )

`4.5m = 4.5* 100cm`

`= 450 cm`.

Let the value of radius be r.

Now, putting the formula of circumference to get the radius:

Circumference=
`2\pi r`

`450 =`
`2* 3.14* r` (putting the value of π = 3.14)

`450=`
`6.28* r`

Dividing by 6.28 on both the sides:

`71.65=r`

Radius = 71.65cm

Therefore, the radius of the tabletop in cm is 72 cm (approximately).