HELP Which equation can be used to calculate the area of the shaded triangle in the figure below?

A rectangle with length of 12 feet and width 4 feet. A diagonal cuts the rectangle into two halves. One of the triangular halves is shaded.

(5 points)

Group of answer choices

2(12 + 4) = 32

fraction 1 over 2 (12 + 4) = 8

2(12 × 4) = 96

fraction 1 over 2 (12 × 4) = 24

Can you me find the missing length. i attached an image.

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