There are many ways to measure a contact angle, but the simplest way is to use a goniometer. The image of the droplet is taken with a high resolution camera; the angle can then be measured using a protractor.
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they both measure the angle in degrees
each measure of the angle at point h has a measure of
the answer is twice. the angle of rotation is twice the measure
The measure of a right angle is 90 degrees .
A protractor can be used to measure an angle.