mallyosburn

12.11.2019 • 

Mathematics

Question: "in the figure below, both circles have the same center, and the radius of the larger circle is r. if the radius of the smaller circle is 3 units less than r, which of the following represents the area of the shaded region? "
answer is: (pi)r^2-(pi)(r-3)^2
*can someone explain how? i don't even know how to start. ~will draw diagram under~

Ответ:

Kazya4

09.01.2022

Mathematics

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The formula for the area of a circle is πr^2, where r is the radius of the circle.
The area of your figure is (outer circle)-(inner circle)
plugging in R and R-3 for radii:
the area of the shaded region is (pi)R^2-(pi)(R-3)^2
hope this helped!

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Ответ:

TheSpeedster

27.10.2021

Mathematics

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11 pieces. he would have 3/4s of his rope left by the way

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