Image source: http://www.selfsteer.com/monitor/covers/MonitorCOV.jpg
Boats use angles to navigate in the ocean by setting their stearing to a certain
number of degrees from North..
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Baseball and softball players swing their bats at different degrees to determine
whether they will hit a ground ball, a line drive, or a deep fly ball.
The degree of an angle can be measured using a device called a protractor. An example of a protractor is shown below.