Find the value of c.

Step-by-step explanation:

the sum of the angles in a triangle is 180

33+2c+c-18=180

3c=180+18-33

3c=165

c=165/3

c=55

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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