Two gears are connected and are rotating simultaneously. the smaller gear has a radius of 4 inches, and the larger gear has a radius of 7 inches. two circles touching at one point. larger circle has radius of 7 inches. smaller circle has radius of 4 inches. part 1: what is the angle measure, in degrees and rounded to the nearest tenth, through which the larger gear has rotated when the smaller gear has made one complete rotation? part 2: how many rotations will the smaller gear make during one complete rotation of the larger gear?

Draw a diagram to illustrate the problem as shown below.

When the smaller gear rotates through a revolution, it sweeps an arc length of
2π(4) = 8π inches.

Part 1
The same arc length is swept by the larger gear. The central angle of the larger gear, x, is
7x = 8π
x = (8π)/7 radians = (8π)/7 * (180/π) = 205.7°

205.7° (nearest tenth)

Part 2
When the larger gear makes one rotation, it sweeps an arc length of 
2π(7) = 14π inches.
If the central angle for the smaller gear is y radians, then
4y = 14π
y = 3.5π radians = (3.5π)/2π revolutions = 1.75 revolutions

The smaller gear makes 1.75 rotations

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