The circle's diameter is 2.2 inches. How can I find the diameter? I know how to find the radius- area=pie mulitiplied by the Radius squared
Thanks a lot! :)
2007-03-11 15:40:51 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Measure from one quadrant of the circle straight across the center to the other quadrant. This is the diameter.
If you want to know the circumference (distance around the circle), the formula is PI times the Diameter.
2007-03-11 15:47:00 · answer #1 · answered by JV 5 · 0⤊ 0⤋
If you know the diameter then you also know the radius. Remember the radius is from the mid point of the circle to the perimeter of the circle and the diameter like a cross section. So take the diameter and divide it by two so in your case 2.2/2=1.1 Now take what you already know and complete the equation.
2007-03-11 15:53:29 · answer #2 · answered by Paul and Kelle A 4 · 0⤊ 0⤋
The area of a circle is given by the equations A= pi*r^2 which is the same as A = pi*diameter^2/4. So if your diameter is, say 10 inches, r, or the radius is d/2 or 5 inches. And the area would be 3.1416*(5)^2 = 25*3.1416 or 78.54 square inches
2007-03-11 15:46:39 · answer #3 · answered by Larry L 3 · 0⤊ 0⤋
Pi * Radius squared...
Radius is 1/2 Diameter.
2007-03-11 15:44:14 · answer #4 · answered by jwissick 3 · 0⤊ 0⤋
Diameter = 2 * Radius.
Thus the radius of this circle is 1.1 inches.
Thus A = pi * r^2.
1.21pi inches squared is the area or 3.801 inches squared.
2007-03-11 15:45:23 · answer #5 · answered by Jeff U 4 · 0⤊ 0⤋
If you know that area = radius squared x pi, then you need to know how to get the radius from the diameter.
Diameter is the distance from side to side, passing through the center.
Radius is the distance from the center to the side.
In case that doesn't make it immediately obvious to you, the radius is half the diameter.
Good luck. :)
2007-03-11 15:45:08 · answer #6 · answered by The Tridentine Avenger 3 · 0⤊ 0⤋
you are confusing me, you say you have the diameter, then you want to know how to find it. ffand in the actual question u ask how to get the area and then answer your own question...reread you question then my answer will make sense i hope
2007-03-11 15:50:51 · answer #7 · answered by livelife2luvNbLuved12345 2 · 0⤊ 0⤋
Your Question doesn't make much sense look at it again.
2007-03-11 15:45:56 · answer #8 · answered by Professor♫ 2 · 0⤊ 0⤋
A=ÏR²
r=d/2
So you would have:
A=Ï1.1²
A=3.8 inches squared.
2007-03-11 15:44:57 · answer #9 · answered by Chris_Knows 5 · 0⤊ 0⤋
if d=2.2; then r=d/2=1.1
A=Ï*1.1^2=1.21Ï=3.8 in^2
2007-03-11 15:50:53 · answer #10 · answered by yupchagee 7 · 0⤊ 0⤋