2006-08-28 12:35:31 · 19 answers · asked by Family Tech Support 3 in Education & Reference ➔ Other - Education
r2 * pi i think
2006-08-28 12:37:19 · answer #1 · answered by red sox! 3 · 0⤊ 1⤋
Not enough information given...
What information do you have to start with about the circle?
The diameter is twice the length of the radius (which is the distance from the center to one side).
If you knew the distance around the circle (perimeter, or circumference) then you could use the formula:
circumference = Pi x Diameter
to solve for the diameter.
Failing all of that, if the circle is fairly small, take a tape measure and measure from one side through the center to the other side. That is the diameter. If the circle is something like the earth, the moon, or the sun, you will need a pretty long tape measure that won't melt or freeze solid, and a good rocket ship.
2006-09-01 16:03:17 · answer #2 · answered by zahbudar 6 · 0⤊ 0⤋
You measure across the circle, this is the diameter. That length divided in half is the radius.
P.S. you can use this measurement to find the circumference which is the distance around the circle or perimeter. The formula for this would be:
circumference= diameter X pi
If you only have the circumference, the formula for diameter is:
diameter= circumference / pi
If you only have the radius, just multiply that by two to get the diameter.
If you don't have a Pi button on your calculator, you can use 3.14
Good Luck! <3
2006-09-05 04:21:14 · answer #3 · answered by Anonymous · 0⤊ 0⤋
diameter is the segment that goes across the circle through the center.
If you have the actual circle, you can use a ruler to measure it.
If you're solving a problem, depending on the information that you have . . d = C / pi (diameter = Circumference divided by pi)
Or if you know the length of the radius . . d = 2r (diameter = 2 times radius)
hope that helps . .
2006-09-04 01:24:06 · answer #4 · answered by ♥LoisLane♥ 4 · 0⤊ 0⤋
You need to have some information to find actual diameter of the circle, like area of the circle, or circumference of the circle.
If you know area of the circle then the diameter of the circle will be equal square root of 4 * Area divided by pi (3.14)
If you know circumference of the circle then the diameter of the circle will be equal circumference divided by pi (3.14)
2006-09-04 13:05:22 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Radius- a segment that has one endpoint at the center and the other point on the circle.
Diameter is a chord that passes through the center of a circle.
Circumference, is the distance around the circle.
chord is a segment whose endpoints are on the circle.
Circumference = pie*diameter
2006-08-28 13:18:18 · answer #6 · answered by buntigger2 2 · 0⤊ 0⤋
Measure it with a ruler passing through the centre.
Alternatively, put a set square with the right angle on the circle. The other two crossing points will be on a diameter.
2006-08-28 12:38:46 · answer #7 · answered by Mesper 3 · 0⤊ 1⤋
the diameter the a circle is like how wide the circle is. just measure the length across the middle of the circle and that's how you get diameter.
2006-08-28 12:47:33 · answer #8 · answered by ~Z. 4 · 0⤊ 0⤋
Diameter equals twice the radius.
2006-09-04 07:18:44 · answer #9 · answered by Ice 6 · 0⤊ 0⤋
you do not specify the position--as in what proper--in the trapezoid, the circle is placed. At proper and bottom, the answer is common. the realm of a circle is the sq. of the radius x Pi, so on the proper the realm is 4 x Pi and on the bottom 36 x Pi. issues get more beneficial exciting in between--yet i am going to leave that to others, in view that this changed into in basic terms printed.
2016-11-28 03:13:40 · answer #10 · answered by ? 4 · 0⤊ 0⤋
2 x Radius
A straight line through the center (with a ruler for instance)
the square idea mentioned above
circumference divided by pi
NOT: pi * r squared (that's the area)
2006-08-28 12:47:18 · answer #11 · answered by iwantaprofilenamealready 2 · 0⤊ 0⤋