how to calculate area of circle?
回答 (12)
2008-08-15 11:34 am
✔ 最佳答案
a = πr^2(area = pi * radius * radius)
2008-08-15 11:47 am
If you have the radius of the circle it is A=Pi*r^2 where Pi≈3.141592654, if you are given it as a function (ie y=+-sqrt(1-x²)) then you would be best of getting the standard form of the equation of the circle (which in this case would be X^2+Y^2=1 where then r would be sqrt(1) = 1, so you would get A=Pi*r^2 = Pi.
2008-08-15 10:49 am
Cool just PIE R^2 or PIE D where r=radius an D =diameter of the circle.
2008-08-15 10:42 am
area of circle = pi*(radius^2)
pi= 3.14 or 22/7 as per given
pi= 3.14 or 22/7 as per given
2008-08-15 10:40 am
formula to find the area of the circle is pi* r^2.
where pi = 22/7 or 3.14
r is the radius of the circle
where pi = 22/7 or 3.14
r is the radius of the circle
2008-08-15 10:36 am
area of a circle = pi * radius^2 , pi = 3,14159
2008-08-15 10:33 am
simple my friend pi*r^2 so if you had a circle with a diameter of 4cm, you half it to find the radius (2cm) then you would do 2Cm^2*pi for this it would be roughly (from my head) 12cm.
2008-08-15 10:32 am
Area = pi * (radius)^2
2008-08-15 10:32 am
area of a circle = pi * radius^2 , pi = 3,14
2008-08-15 12:49 pm
area of a circle is = pi*(radius)^2
pi=3.1412
for eg:a circle of radius 2cm is give .calculate the are of circle?
formula: Area of circle is 2*pi*r^2
2*3.1412*(2)^2
2*3.1412*4
25.1296 sq cms
pi=3.1412
for eg:a circle of radius 2cm is give .calculate the are of circle?
formula: Area of circle is 2*pi*r^2
2*3.1412*(2)^2
2*3.1412*4
25.1296 sq cms
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