Machinists Often Use a Coordinate System to Drill Holes by Placing

question 110

Multiple Choice

Machinists often use a coordinate system to drill holes by placing the origin at the most convenient location. A bolt circle is the circle formed by completing an arc through the centers of the bolt holes in a piece of metal. Find the coordinates of the centers of points A, D, and G for the equally spaced $\frac { 1 } { 3 }$ -in. holes on a bolt circle of radius 7.00 in., as shown in the illustration. Round your answer to the nearest tenth.

• A) A = (-4.9, 0.0) D = (7.0, 4.9) G = (0.0, -7.0)
• B) A = (7.0, 0.0) D = (-4.9, -7.0) G = (0.0, 0.0)
• C) A = (7.0, 0.0) D = (-4.9, 4.9) G = (0.0, -7.0)
• D) A = (7.0, -7.0) D = (-4.9, 4.9) G = (0.0, 0.0)

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