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A =39 ft^2

Step-by-step explanation:

The area of the triangle is given by

A = 1/2 bh  where b is the base and h is the height

The base is 5+8  and the height is 6

A = 1/2(5+8) *6

A = 1/2 *13*6

A =39 ft^2

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

no one knows lol

step-by-step explanation: