The given triangle has a base of 4 feet, and the height is 8 feet.
To find the amount of paint used we need to find the area of the triangle .
Area of triangle can be found by the formula
A=
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Area of the triangle =

Area of triangle =
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It takes 0.2 quart of paint to cover 1 square foot
To cover 16 square foot amount of paint used = 16(0.2)= 3.2 quarts.
Alberto uses 3.2 quarts of paint.