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Below is the justification for the formula for area of a circle. Which word,
when placed in the blank, best completes this argument?
The circumference of a circle is given by the formula C-2, where ris
the radius.
If the circle is divided into equally sized sectors, the sectors can be
rearranged to form a shape that approximates a parallelogram.
.
,
The base of the parallelogram is and the height is r.
Because the area of a parallelogram is equal to the product of the base
and the height, the area is
..
Therefore, the area of a circle is given by the formula ².
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OA. half the radius, or
or
OB. half the circumference, or
C. the circumference, or 2
D. the radius, r
