Question

Find the radius of a circle whose diameter is 21 cm​

Answer 1

Answer:

Radius of circle is 10.5 cm .

Step-by-step explanation:

Given information,

Diameter of circle is is 21 cm

We have to find out the value of The radius of a circle.

Diameter is a straight line from one side to the other side that passes through the center point of a circle.

As we know that ,

Radius is half of diameter.

Radius = Diameter ÷ 2

As per the given data ,

Radius = 21 ÷ 2

By dividing by 2 we get

Radius = 10.5

Hence,

Radius of circle is 10.5 cm .

Answer 2

Answer:

The radius of a circle is 10.5cm.

Step-by-step explanation:

In context to the question asked,

We have to find the radius of a circle,

It is given that,

Diameter of a circle ( d ) = 21cm

The radius is half of the diameter.

The radius is always half the length of its diameter.

So, the formula to be used for determining the radius of a circle:

${\tex=> R = \frac{d}{2}$

Now, substitute the given values in the above formula:

$=> R = \frac{21}{2}$

Divide 21 by 2 we get

=> R = 10.5cm

Hence, the required solution is 10.5cm.