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phi
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You need to find the radius of the circle. Sketch the problem and draw in a radius
make it perpendicular to one of the triangle's sides.

phi
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dw:1389710684921:dw

phi
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do you know about 306090 triangles? and how to find the length of the short side (the radius "r")?

stupidinmath
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36090 yes.
radius? just divide the diameter by 2 right?

phi
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You don't know the diameter.
See the picture posted up above. what is ½ of the triangle's side?

phi
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sides are 28√3 long.

stupidinmath
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14√3

phi
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dw:1389711592719:dw

stupidinmath
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use tan30= r/14√3?


phi
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can you find "r" ?