You can use straight angles to make sure countertops, or walls are straight and in a right formation.
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He was the father of geometry and he discovered many ways of finding angles
One triangle is similar to another if the angles of one are the same as the angles of the other. Since the three angles must sum to 180, it is enough that two of the angles of one triangle are the same as the corresponding two of the other. Equivalently, the three corresponding sides of the two triangles must be in the same proportion.
They are both two dimensional. They only have right angles at line intersections. Opposing sides are parallel. Opposing sides are the same size.
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four sides, four right angles, 2 pairs of parallel lines