# Math Help - compact disc with diameter of 120mm

1. ## compact disc with diameter of 120mm

A compact disc is 120 mm across with a center hole of diameter 15mm. The center of the disc is at the origin.

1. What are the coordinates of the points at which the inner and outer edge intersect the positive x-axis?

2. What are the coordinates of the points at which the inner and outer edges cut a line making an angle theta with the positive x-axis?

Im having trouble with this and any help would be appreciated

2. 1. What is the inner and outer radius?
2. Have you studied learned the trig functions in terms of r, x, and y? If so, r is the radius, and (x, y) is your answer.

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