Michael J. answered • 02/23/17
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
When they say express in terms of pi, the circumference and area must not be approximations.
Use the fact that
C = dπ
A = (d2π) / 4
where:
C = circumference
A = area
d = diameter
Michael J.
Formula deriving.
Since r = d/2
A = π(d/2)2 ----> substituting d for r
A = (d/2)(d/2)π
A = (d2π) / 4 ---> area in terms of d
Report
02/24/17
Tim C.
02/23/17