Does anyone know how to do this? I’m really confused on this question. Also please explain or show work on a piece of paper to get marked =]

Does anyone know how to do this? I’m really confused on this question. Also please explain or show work on a piece of paper to get marked =] class=

Answer :

(3*0.5)/2=0.75 in^2
The lines are just helping you to see that the shaded space is half of the rectangle

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