To get the area of a rectangle, multiply the side lengths.
Our side lengths of this rectangle is 1/2 and 3/4, so let's multiply them.
[tex] \dfrac{1}{2} * \dfrac{3}{4} = \dfrac{3}{8} [/tex]
Thus, the area of this rectangle is 3/8 ft². I hope this helps! :)
~AgentCozmo4, Moderator