Measure with a Protractor
Center on the vertex, line up 0° with the starting arm, then read from that scale
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Center on the vertex, line up 0° with the starting arm, then read from that scale
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Why do protractors have two rows of numbers? Because measuring from the left and from the right reads differently — the key is to lay the 0° line on one arm of the angle and count from that 0°. Here you can drag, rotate and flip the scale rows as often as you like, practicing from ten-degree steps all the way down to one-degree precision.
Drag the translucent protractor until its 0° line sits on the starting arm, read the correct scale, and pick the angle from four choices.