tetra and 1
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A tetrahedron is a polyhedron with four sides (tetra means 4) that are triangles. So one fourth of a tetrahedron is a triangle.
It means four.
One fourth plus one half plus one half plus 1 is equal to 2.25 or 2 1/4
Three-fourths is one-fourth plus one-fourth plus one-fourth.
1/6 plus 1/5 plus 1/4 plus 1/3 plus 1/2 = 1 9/20 or 1.45