Question

A turntable has a diameter of 40 cm what its circumference

Answer 1

Answer:

Circumference of turntable is 125.6 cm

Step-by-step explanation:

Diameter of turntable = 40 cm

We need to find circumference of turntable.

The formula used to calculate circumference is: $Circumference=2\pi r$

where r is radius

We know that: $radius=\frac{diameter}{2}$

Finding radius first:

$radius=\frac{diameter}{2}\\radius=\frac{40}{2}\\radius = 20 \ cm$

So, radius r=20 cm

Now finding circumference

$Circumference=2\pi r\\Circumference=2\times3.14\times20\\Circumference=125.6 \ cm$

So, circumference of turntable is 125.6 cm