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slava [35]
3 years ago
14

if the circumference of a circle measures 3π cm, what is the area of the circle in terms of π? A) 3 4 π cm2 b) 3 2 π cm2 c) 9 4

π cm2 d) 9 2 π cm2
Mathematics
2 answers:
JulijaS [17]3 years ago
6 0

The circumference of a circle is given by

C = 2\pi r

Where r is the radius of the circle. So, you have

3\pi = 2\pi r \iff 2r = 3 \iff r = \dfrac{3}{2}

The area of a circle is given by

A = 2\pi r^2

If you plug the value for r you have

A = 2 \pi \left(\dfrac{3}{2}\right)^2 = 2\pi\dfrac{9}{4} = \dfrac{9}{2}\pi

zavuch27 [327]3 years ago
6 0

C = 2*π*r

3π = 2π*r

\frac{3\pi }{2\pi } = \frac{2\pi *r}{2\pi }

\frac{3}{2} = r

A = π * r²

   = π (\frac{3}{2} )^{2}

   = π (\frac{9}{4} )

Answer: C

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