The circumference of a coin is 7.42cm. what is the diamater, radius, and area? use 3.14 for π

So circumference of a circle is , with r = radius. Using what we have, we can solve for r.

Firstly, multiply everything on the right side of the equation.

Next, just divide both sides by 6.28, and your answer should be

Next, the diameter is just the radius times 2, which is 2.36.

Lastly, Area of a circle is . Using what we have, we can solve for area.

Firstly, solve the exponents:

Next, just multiply the right side, and your answer should be

In short, 1.18 cm is the radius, 2.36 cm is the diameter, and the area is 4.37 cm^2

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