Although they are altitudes, they are normally called the legs.
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They are called the legs or the catheti.
In a right triangle, the two shorter sides are called legs.
They're called the "legs" of the triangle. The side that doesn't touch the right angle is called the "hypotenuse".
The hypotenuse is the longest side of any right triangle, and the legs are the two legs coming out from where the right angle is.
A right triangle is triangle with an angle of ( radians). The sides , , and of such a triangle satisfy the Pythagorean theorem(1)where the largest side is conventionally denoted and is called the hypotenuse. The other two sides of lengths and are called legs, or sometimes catheti.