Name of this shape thanks
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Two angles are called complementary if their measures add to 90 degrees, and called supplementary if their measures add to 180 degrees.
In radians this are
To find the complement of 3π/4, subtract it by π/2
To find the supplement of 3π/4, subtract it by π.
The number of permutations of the 4 different letters, taken two at a time, is given by:
