It's been many MANY years since I did maths at school and I can't remember if the Diameter is from half way from the centre of a circle to the edge or if it's straight across from one side to the other.
2007-09-13 22:12:02 · 23 answers · asked by Mikey B 2 in Science & Mathematics ➔ Mathematics
diameter is straight across the circle, and is twice the length of the radius, which is only halfway across the circle. circumference is the perimeter of the circle.
here's some formula for finding stuffs related to a circle:
AREA of circle= radius x radius x 3.14 or 22/7
semicircle= 1/2 x radius x radius x 3.14 or 22/7
quater-circle= 1/4 x radius x radius x 3.14 or 22/7
an arc = (angle of the circle)/ 360 degrees x radius x radius x 3.14 or 22/7
PERIMETER of circle= diameter x 3.14 or 22/7
semicircle= 1/2 x diameter x 3.14 or 22/7
quater-circle= 1/4 x diameter x 3.14 or 22/7
an arc = (angle of the circle)/ 360 degrees x diameter x 3.14 or 22/7
2007-09-14 00:02:10 · answer #1 · answered by Anonymous · 1⤊ 0⤋
It is straight across the circle from one side to the other. The other one, from the centre to the edge of the circle is radius and is half the diameter.
If you know the centre, it is easier to measure the radius and double it to get the diameter.
A line not passing through the centre is a chord. The diameter is the maximum chord for a circle.
2007-09-13 22:17:23 · answer #2 · answered by Swamy 7 · 4⤊ 0⤋
In geometry, a diameter (Greek words diairo = divide and metro = measure) of a circle is any straight line segment that passes through the centre of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle.
In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter, because all diameters of a circle have the same length, this being twice the radius.
2007-09-14 02:55:25 · answer #3 · answered by Rod Mac 5 · 0⤊ 0⤋
Diameter is straight across from one side to the other, passing through the centre. From the centre to the edge is the radius.
2007-09-13 22:18:39 · answer #4 · answered by Doug 7 · 1⤊ 0⤋
The diameter is the distance from one adge to the other crossing through the centre of the circle. The measurement from the centre to the edge is called the radius.
2007-09-13 22:17:23 · answer #5 · answered by VikFlik 1 · 1⤊ 0⤋
Use a string to degree around the balloon. via fact circumference is measured by way of TT (pi) circumstances diameter, your balloon will might desire to be approximately 28 a million/4 inches around to have a 9 inch diameter. Diameter isn't 0.5 of the circumference. Sorry to all different answerers.
2016-12-13 08:48:53 · answer #6 · answered by Erika 4 · 0⤊ 0⤋
the diameter is the one straight across through the centre the radius is the one half way
2007-09-13 22:20:40 · answer #7 · answered by v 5 · 1⤊ 0⤋
It's straight across, from one side to the other. The distance from the center to the edge (which is exactly half the diameter) is called the 'radius'.
Doug
2007-09-13 22:18:23 · answer #8 · answered by doug_donaghue 7 · 0⤊ 0⤋
Diameter is all the way across the centre. The radius is from the middle point to the edge. The circumference is all the way around.
This is the only bit of maths I use!!
2007-09-13 22:16:28 · answer #9 · answered by Anonymous · 4⤊ 0⤋
Diameter is all the way from one edge to the opposite side.
Diameter = 2 x Radius
Radius is half way.
2007-09-13 22:19:11 · answer #10 · answered by ideaquest 7 · 1⤊ 0⤋