What is the area of a circle with a circumference of 14π inches? The equation f

游客2024-01-12 30

问题 What is the area of a circle with a circumference of 14π inches?

选项

答案  The equation for the area of a circle is A=πr2. The equation for the circumference of a circle is C=2πr. Since you are given the circumference, you can use that to find the radius, r, and then use the radius to find the area:
14π=2πr
   14=2r
   r=7
Now substitute r into the equation for area:
Area=π(72)
Area=49π

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