Four Right angles are in a solid square because a square has four sides
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Spheres are measured with solid angles (which are like two dimensional angles). These angles can be measure with square degrees or steradians. A sphere measures 129300/π square degrees (or about 41,253 square degrees). A sphere measures 4π steradians (or about 12.566 steradians.)
A square has four 90 degree angles.
4 right angles, no other angles.
four right-angles
There are no obtuse angles in a square. A square is a perfect 90 degree angle.