233k views
4 votes
Ou collect coins. One of your favorite coins is a silver-colored coin showing a person's portrait.

The diameter of the coin is twenty two millimeters.
What is the radius of the coin? What is the circumference of the coin? What is the area of the coin?

1 Answer

4 votes
The radius of the coin is half of its diameter. Therefore, the radius of the coin is:

r = 22 mm / 2 = 11 mm

The circumference of a circle is the distance around its edge, which can be calculated using the formula:

C = 2πr

where π (pi) is a mathematical constant approximately equal to 3.14159. Substituting the value of r from above, we get:

C = 2π(11 mm) ≈ 69.115 mm

So the circumference of the coin is approximately 69.115 mm.

The area of a circle is given by the formula:

A = πr^2

Substituting the value of r from above, we get:

A = π(11 mm)^2 ≈ 380.1327 mm^2

So the area of the coin is approximately 380.1327 square millimeters.
User Susheel Karam
by
7.7k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.