A Round Plate $14$ In in Diameter Is to Have Ten Holes Drilled Through

question 23

Multiple Choice

A round plate $14$ in. in diameter is to have ten holes drilled through it. This is accomplished by creating a drawing for half the circle and the then "mirroring" the drawing for the other half of the circle. The $\frac { 1 } { 2 }$ in. diameter holes are to be equally spaced on a $10$ in. concentric circle in the top half of the plate. What is the angle A between the holes? What is the angle B between the horizontal and each of the end holes?

• A) A = \(36\) °, B = \(30\) °
• B) A = \(72\) °, B = \(36\) °
• C) A = \(60\) °, B = \(30\) °
• D) A = \(60\) °, B = \(18\) °
• E) A = \(36\) °, B = \(18\) °