the expression pie R to the second gives the area of a circle with the radius R. How many square meters of wheat were destroyed when an alien ship made a crop circle of diameter 25 meters in the wheat field?
If I remember right pie is 3.14
hald of the diameter is 12.5 is that the radius.. I guess I am not sure on this one.
2007-06-21 09:26:09 · 5 answers · asked by Mandalicious 1 in Science & Mathematics ➔ Mathematics
You are correct. A = 3.14 (12.5)(12.5) = 490.625
2007-06-21 09:30:53 · answer #1 · answered by Math Master 2 · 0⤊ 0⤋
R=12.5m
area=33.14x(12.5)^2=490.87 m^2
2007-06-21 09:48:11 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Diameter = 25 m
Radius = 12.5 m
Area = π.r ²
Area = π x 12.5² m²
Area = 491 m² (to nearest whole number)
2007-06-25 06:20:34 · answer #3 · answered by Como 7 · 0⤊ 0⤋
Diamter = R + R = 2 R
so R = .5 D
Area (circle) = PI * R* R
A = PI * (.5D) * (.5D)
= .25 * PI * D * D
= .25 * 3.14 * (25m) * (25 m)
= 490.625 (m * m)
= 490.625 squared meter
2007-06-21 09:34:12 · answer #4 · answered by buoisang 4 · 0⤊ 0⤋
right... 3.14(12.5)^2
w/e that comes out to be
2007-06-21 09:33:11 · answer #5 · answered by anotherAzn 4 · 0⤊ 0⤋