congruent, convex, cirlce, circumfrence
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hypotenuse, height, hexagon,
kilometers
Hypotenuse, hexagon
Jefferson factor Jefferson factor does not appear in my mathematics dictionary. Jacobi's polynomials, Jacobian (a determinant), Join (sum of sets), joint variation, and Jordan matrix are some of the mathematical terms beginning with J that do appear in the math dictionary.
In any terms it is a combining form meaning 'three'