Respuesta :

Answer:

A = 10 units^2

Step-by-step explanation:

If you'll draw this rectangle you'll see immediately that the base is (9 - 4), or 5 units and the height is 4 units (5 - 1).

Thus, the area of this triangle is A = (1/2)(base)(height) = (1/2)(5 units)(4 units), or

A = 10 units^2

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