A solid angle, measured from a vertex, is the ratio between the area subtended by the angle at the vertex and the the square of the distance to the vertex. The unit of measurement is the stradian.
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they both measure the angle in degrees
it is same as surface and volume ! a plane angle is 2D and solid angle is 3D
each measure of the angle at point h has a measure of
the answer is twice. the angle of rotation is twice the measure
A protractor can be used to measure an angle.