# Cathetus

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If the catheti of a right triangle have equal lengths, the triangle is isosceles. If they have different lengths, a distinction can be made between the minor (shorter) and major (longer) cathetus. The ratio of the lengths of the catheti defines the trigonometric functions tangent and cotangent of the acute angles in the triangle: the ratio ${\displaystyle c_{1}/c_{2}}$ is the tangent of the acute angle adjacent to ${\displaystyle c_{2}}$ and is also the cotangent of the acute angle adjacent to ${\displaystyle c_{1}}$.