Which is the area of a circle with a diameter of 7 units?

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Which is the area of a circle with a diameter of 7 units?

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Answer 1 · 2015-11-14T10:18:41

The area of the circle is #(49pi)/4#

Explanation:

The diameter of a circle is the length of a chord passing through the center of the circle, and thus is twice the length of the radius of the circle (the distance from the center to the edge).

The area #A# of a circle with radius #r# is given by #A = pir^2#

So, a circle with diameter #7# has radius #7/2# and thus area
#pi(7/2)^2 = (49pi)/4#

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Which is the area of a circle with a diameter of 7 units?

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