How can the area of this triangle be determined by forming a rectangle? Select from the drop-down menus to correctly complete the statements.

Copy and rotate the triangle and place it next to the existing triangle to form a rectangle. The length of the rectangle is
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units. The width of the rectangle is
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units. The area of the rectangle is
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square units.

The area of the triangle is half the area of the rectangle, so the area of the triangle is
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square units.

Right triangle on a grid. One side of the triangle is horizontal and has a length of 5 units. Another side is vertical and has a length of 4 units.