If you have a circle, you put a dot in the middle and call it O
Then you draw a straight line from one end of the circle through O to the other side, and you call one side A and the other side B.
BA is the Diameter
OA is the Radius
O is the Circumference
Is this correct?
2007-08-26 08:18:05 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
BA is the Diameter, yes
OA is the Radius, yes
O is the Circumference, NO - it's the centre.
2007-08-26 08:23:33 · answer #1 · answered by SV 5 · 0⤊ 0⤋
Yes the first 2 are right, the second one is wrong.
If you know how to calculate the circumference of a circle you will see why.
Also O is just a dot in the middle of the circle and isnt really anything.
So to get the circumference of a circle you need:
2 X Pie X R (R is the radius of the circle)
You have called the radius OA
so the answer will be 2 X Pie X OA.
i hope this helped the other answers just seemed to give an answer and not an explanation.
2007-08-26 08:28:22 · answer #2 · answered by Anonymous · 0⤊ 0⤋
O is not the circumference, it is the center of the circle. The circumference is the "perimeter" of the circle which is equal to 2*pi*radius.
2007-08-26 08:22:59 · answer #3 · answered by dr_no4458 4 · 0⤊ 0⤋
BA is the Diameter
OA is the Radius
O would not be the Circumference, it is simply a point in the middle of the circle.
the circumference is equal to 2*pi*(radius)
so the circumference would be
2pi(OA)
2007-08-26 08:24:52 · answer #4 · answered by π∑∞∫questionqueen 3 · 0⤊ 0⤋
The first two are right; the third is wrong.
The circumference would be BA*Pi.
Edit: I notice everyone else is writing the circumference as 2Pi*r, instead of Pi*d. Since 2r = d, the answers are the same. Just trying to avoid confusion. . . .
2007-08-26 08:22:25 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Partly. BA*pi = 2*OA*pi = circumference
2007-08-26 08:25:40 · answer #6 · answered by ironduke8159 7 · 0⤊ 0⤋
your diameter is right and so is the radius(you can also have OB as your radius but both are correct) but O is the center not the circumference,
2007-08-26 08:52:41 · answer #7 · answered by ashley 4 · 0⤊ 0⤋
BA is the diameter
OA is the radius
cir=2.Pi.r=2Pi.OA ans
2007-08-26 08:24:35 · answer #8 · answered by MAHAANIM07 4 · 0⤊ 0⤋