One side of triangle is 7 more than 2 times the shortest side. the third side is 15 centimeters more than the shortest side. the perimeter is 82. find all three sides.

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.

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d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

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