21. graph and label the triangle with the following vertices: a(-2, 4), b(5, -3) and c(-2, -3). determine whether the triangle is scalene, isosceles or equilateral, and explain why you chose your answer.

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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