2007-03-04 04:23:02 · 5 answers · asked by shantol l 1 in Education & Reference ➔ Homework Help
Circumference = Diameter * PI
PI = approximately 3.14159265358979
2007-03-04 04:31:33 · answer #1 · answered by Zefram 2 · 0⤊ 0⤋
Circumference From Latin: circum "around" + ferre "to carry" The distance around the edge of a circle. Also 'periphery'.
Try this Drag the orange dots to move and resize the circle. The circumference is shown in red. Note the radius changes and the circumference is calculated for that radius.
You sometimes see the word 'circumference' to mean the curved line that goes around the circle. Other times it means the length of that line, as in "the circumference is 2.11cm".
If you know the radius
Given the radius of a circle, the circumference can be calculated using the formula where:
R is the radius of the circle
Ï is Pi, approximately 3.142
If you know the diameter
If you know the diameter of a circle, the circumference can be found using the formula
where:
D is the diameter of the circle
Ï is Pi, approximately 3.142
If you know the area
If you know the area of a circle, the circumference can be found using the formula
where:
A is the area of the circle
Ï is Pi, approximately 3.142
Related measures
Radius The radius is the distance from the center to any point on the edge. See radius of a circle
Diameter The distance across the circle. See Diameter of a Circle for more.
2007-03-04 12:30:36 · answer #2 · answered by moon_girl 2 · 0⤊ 0⤋
2 times 3.14 time the radius (half the diameter)
2007-03-04 12:30:28 · answer #3 · answered by ray91_91 2 · 0⤊ 0⤋
circumference is the distance around.
2007-03-04 12:30:01 · answer #4 · answered by wind it up 4 · 0⤊ 0⤋
isn't it radius sqared?
2007-03-04 12:30:47 · answer #5 · answered by weebegee 1 · 0⤊ 0⤋