You should use a special device for measuring angles - a protractor. With a ruler, it is much more complicated, but still possible: you can mark two points on the angle, one on each side; measure the distance from the vertext of the angle to those points; measure the distance between the points; then use the Law of Cosines to calculate the angle.
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1. Ruler (length, height, width) 2. Meter Stick (length, height, width) 3. Protractor (angle)
A = 60 B = 20 C = 140 This can have a large number of answers.
measure
55°
angle with the greatest measure