- Thread starter sjm
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The two red lines are parallel. The two black lines are in fact dimension leader lines but yes also parallel.

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We are trying to help you - we are trying to help you discover the answer.

The two red lines are parallel. The two black lines are in fact dimension leader lines but yes also parallel.

Do you know laws of sines for triangles?

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This problem is as simple as knowing the definition of secant(x) = hypotenuse/adjacent. You have one red triangle which has a 90 degree angle. You can easily figure out the angle by the center of the circle. Using secant you can find the length of the hypotenuse which is the same length as the side which you want.

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