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Which formulas represent linear relationships? Select all that apply.$\newline$Multi-select Choices:$\newline$(A)the area of a semicircle, $A = \frac{\pi r^2}{2}$$\newline$(B)the volume of a square pyramid with a height of $1$, $V = \frac{1}{3}s^2$$\newline$(C)the perimeter of a regular pentagon, $P = 5s$$\newline$(D)the volume of a hemisphere, $V = \frac{2}{3} \pi r^3$