2006-06-22 10:09:29 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
16pi. You can explain how you get this when you write up your homework!
2006-06-22 10:15:21 · answer #1 · answered by Andrew H 2 · 0⤊ 1⤋
A = pi r²
C = 2pi r
EXPLANATION:
You are given C, and you need to find A. I gave you two formulae where the radius r is included. For the first part, equate your given value of C to the formula, and solve for r:
C = 8pi cm so,
8pi cm = 2pi r
divide 2pi to both sides
r = 4 cm
And then substitute the value of the radius to area formula A = pi r²
A = pi(4 cm)²
A = pi(16 cm²)
A = 16pi cm²
Hope this helps
^_^
2006-06-23 00:56:30 · answer #2 · answered by kevin! 5 · 0⤊ 0⤋
A=16/picm^2
2006-06-22 10:35:49 · answer #3 · answered by Anonymous · 0⤊ 0⤋
A = Pi (r)^2 .... since the Circumference is 8pi and C = Pi (D) or Pi (2r), then r = 4
A = Pi (4)^2 ... 16Pi
2006-06-22 10:21:36 · answer #4 · answered by icehoundxx 6 · 0⤊ 0⤋
A=16 pi cubed
2006-06-22 10:18:50 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Weeeelll... you've got two equations, area=Pi(radius^2) and circumference=Pi(diameter) which is the same as Pi(radius*2). So, you can sub in a value for "circumference", find the value for radius, and there you go.
2006-06-22 10:16:11 · answer #6 · answered by Cedar 5 · 0⤊ 0⤋