how to find the outside diameter of a circle?

Answer 1

Place a pencil compass on the edge of the circle .Swing an arc ..go to the other side swing another arc make sure the arcs are more than half the diameter. The intersection of these two lines will be two points which when connected will give you a line that goes right through the center of the circle. You then take a measurement along this line and you have it.. (the diameter) you have bisected a circle. ..Now if its a circle on a piece of paper that is small it works well with a compass and if your working with larger circles say 50meters a string and stake will do nicely. The relationship of the circumference to the diameter is Pi which equals 3.14159(rounded here) So if you can effectively measure the distance around the circle divide by Pi to get the diameter.

Answer 2

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I think you're looking for the length of the 'Circumference of the circle (The distance around it). The widh is known as the Diameter...distance across the centre of the circle. Circumference is Pi (3.142) x the Diameter. Circumference = ' π x D ' D / 2 = Radius

Answer 3

There is no such thing as the outside diameter of a circle.

Answer 4

Don't know why you say outside;-} there is no inside diameter.
What were you given to start with?
The relationship between a diameter & perimeter is Pi.
The perimeter is 3.1426 times the diameter

Answer 5

If you are measuring an O-ring,or other object that is large and unstable, is when a person would need the formula for the outside diameter.

Answer 6

If you mean circumference then that's pi times diameter.

Answer 7

πD or 3.1416 * D (the diameter of the circle)