1. The center of a soccer field has a diameter of 20 feet. Find the area of the circle. 2. A flowerpot has a circular base with a diameter of 27 centimeters. Find the area of the base of the flowerpot I missed that class, so I have NO clue of how you do this, please also explain how you do this!10 POINTS!
2007-01-06 08:30:41 · 8 answers · asked by ♥Roberta. 5 in Science & Mathematics ➔ Mathematics
Area = pi radius squared
A = 3.1416 x 15 x 15 = 706.86 sq feet soccer field
A = 3,1416 x 13,5 x 13.5 = 572.5566 sq cm Flowerpot
To do these areas use the formula "pi" which equals 3.1416
then find the radius. If you know the diameter, the radius is half of the diameter. Then square the radius. That is multiply the radius by the radius. multiply the radius by the radius by 3.416 and you obtain your answer for finding the area of circles.
2007-01-06 12:08:16 · answer #1 · answered by David C 2 · 0⤊ 0⤋
Basically to find the area of any circle, you use pi*r(squared). where r is the radius of the circle. The radius is half of the diameter, or the distance from the exact middle point of the circle to any point on the outside edge. Pi is a constant, which can be estimated at about 3.14. There is also a button on most calculators that inputs pi.
For the first problem, you could do this. First, you know 20 feet is the diameter. Now you take half of that to find the radius. Then you square that (multiply it by itself), and finally you multiply this by pi.
This will work for any circle at all, as long is it actually is a circle.
2007-01-06 08:45:28 · answer #2 · answered by wepter1 1 · 0⤊ 0⤋
The area of a circle is A = pi *r^2.
to find the radius, you need to divide the diameter by two because the radius is just half of the diameter.
once you have the radius, just substitute into the formula and solve!
2007-01-06 08:35:23 · answer #3 · answered by keely_66 3 · 1⤊ 1⤋
the area of a circle is pi* radius * radius. The radius is half the diameter. pi is 22/7
Hope this helps you. Sorry i don't give the actual answers, thats up to you.
2007-01-06 08:37:42 · answer #4 · answered by jewelking_2000 5 · 0⤊ 1⤋
section= pi * radius squared so, you are able to desire to have a pi button on your calculator take pi situations your radius squared. your radius is 4, 0.5 of 8 and four squared or 4*4=sixteen. your answer is sixteen*pi. circumference= 2*radius*pi your radius is 4, 0.5 of 8. 2*4=8. end out the formuala 8*pi is your answer.
2016-11-27 00:20:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
for a circle, A=π r^2
1) d=20'
r=d/2=20/2=10'
A=π 10^2=100π=314ft^2
2) d=27cm
r=d/2=27/2=13.5cm
A-π r^2=π 13.5^2=182.25π=573cm^2
2007-01-06 08:46:41 · answer #6 · answered by yupchagee 7 · 0⤊ 0⤋
Area = 3.14(0.5 * diameter )^2
area = pi (0.5 * diameter)^2
(0.5 * diameter)^2 means (0.5 * diameter) * (0.5 * diameter) which is means (0.5 x diameter) x (0.5 x diameter)
2007-01-06 09:03:15 · answer #7 · answered by Raoof 2 · 0⤊ 0⤋
pi*radius*radius
2007-01-06 08:44:37 · answer #8 · answered by ivorytowerboy 5 · 0⤊ 0⤋