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.
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7.5Radius of circle: 15/2 = 7.5 cm
15 cm
A circle with a radius (d/2) of 15 cm has a circumference of 94.2 cm
Divide the circumference by pi, and you'll get the answer. 19.74 cm.
The diameter of a circle with a circumference of 15 centimeters is about 4.775 cm