Rotations and distance tells you about the circumference and this tells you about the diameter. How about a specific problem?
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wheel diameter times pi times number of rotations
circumference of a circle = pi*diameter or 2*pi*radius
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
First find the circumference of the whole circle using Pi x diameter. Halve the answer and add the diameter. Thus: 3.1416 × 10 = 31.416 ÷ 2 + 10 = 25.708cm So the perimeter of the semi-circle is 25.7cm
To find the distance around a figure, you calculate the perimeter. The perimeter is the total distance around the outside of a shape or figure. To find the perimeter of a rectangle or square, you add up all the sides. For a circle, you can find the perimeter by multiplying the diameter by π (pi).