2. What is the circumference of a circle with a radius of 22 centimeters? Use 3.14 for at

Mathematics

1 answer:

erma4kov [3.2K]2 years ago

4 0

Answer:

138.16 feet

Step-by-step explanation:

$C = 2\pi \: r \\ = 2 \times 3.14 \times 22 \\ = 44 \times 3.14 \\ = 138.16 \: feet$

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A circle has a radius of 5 centimeters. What is the area?

schepotkina [342]

Answer:

$25\pi$

Step-by-step explanation:

The formula for the area of a circle is $A=\pi r^{2}$ , r is your radius, A is your area, and π is pi (3.1415...). You plug in your radius, or 5 into r, square it, 25, and multiply it by pi. You may be asked to use a certain number of digits of pi, and in that case you multiply for example 3.14 by 25, however $25\pi$ is the exact answer.