Tie a weight to a piece of string. Hold the other end of the string to create a makeshift pendulum. Gravity will make the weighted string point directly to the Earth's center of mass. Measure the angle between the ground and the string.
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Transit
Of the land surface, you may refer to slope, or gradient. In geology, the dip angle is the name given to the angle down which a strata follows.
The point about which an angle is measured
straight angle
An angle of 220 degrees is a reflex angle