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| Math Central | Quandaries & Queries |
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Question from rogerson, a student: The length of the tangent to a circle is 15 cm. If the angle between the two tangent lines to the circle is 28 degrees, what is the radius of the circle? |
Rogerson,
The measure of the angle RPQ is 28o and thus the measure of the angle RPC is 14o. Since CR is a radius of the circle and PR is tangent to the circle, angle CRP is a right angle. What trig function relates the angle RPC and the sides CR and RP?
Penny
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