Question

diameter is 420 CM what is the radius and circumference for 420 cm​

Answer 1

Before, finding the answer. Let's find out what we have to find in this answer.

• In this question, we are asked to find the radius and the circumference whose diameter is 420 cm.

_____________________

Given :

• Diameter = 420 cm

To find :

• the radius and circumference

Steps :

• We have to divide the diameter by 2 to get the radius.
• Then, we have to use Circumference of Circle formula to find the Circumference.

Solution :

⇒ Let's find the Radius.

Diameter = r × 2

Radius = d/2

           = 420/2

           = 210 cm

⇒ Now, let's find the Circuference.

Circumference = 2πr

                         = 2 × 22/7 × 210

                         = 420 × 22/7

                         = 420 × 22/7

                         = 9240/7

                         = 1320

Therefore, the Circumference of the circle is 1320 cm.