45 degrees, if the wedges are equal.
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There are various ways of measuring circles, since a circle has a radius, a diameter, and a circumference, so your question asking how to divide a circle to 15 cm is not as precisely stated as it might be. You can use a segment of a circumference to get 15 cm, by taking the appropriate wedge out of the circle, but even then, unless we know what the radius of the circle is, we cannot tell you what angle is needed to obtain the wedge you want, with a 15 cm circumference.
If you measure the middle of the circle and then times it by 3
the amount of space inside a circle
Measure the width of the circle and multiply X 3.14 or PII and divide by 12
The circumference of a circle measures the distance around the circle.