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Homework Help Forum: Trig
Posted by Ashley on Sunday, October 4, 2009 at 3:56pm.
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A 30 degree central angle is in central position in a circle with a radius of 7 square roots of 5 (245). What are the coordinates of the point where the terminal ray intersects the cicrle?
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- Trig - Reiny, Sunday, October 4, 2009 at 4:28pm
construct a right angled triangle
and call the point at the circle (x,y)
then sin30 = y/7√5
y = (1/2)(7√5) = 7√5/2
cos30 = x/7√5
x = (√3/2)(7√5) = 7√15/2
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