Find the missing angle measure in QRS. Q = _____°, R = 60°, S = 20° A. 80 B. 100 C. 120 D. 60

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Find the missing angle measure in QRS. Q = _____°, R = 60°, S = 20° A. 80 B. 100 C. 120 D. 60

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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R+S+Q=180 60+20+Q=180 Q=180-80=100
sum of three angles in a triangle is 180 degrees
The interior angles of a polygon with n sides add up to (n-2)*180 (degrees). This is a triangle, 3 sides, n = 3, so the sum of the interior angles is (3-2)*180 degrees. You've already got 60+20 = 80 degrees accounted for, so the remaining angle is 180 degrees - 80 degrees = 100 degrees

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With a rectangle, there are 4 sides, so n = 4, and the interior angles add up to 2*180 degrees = 360 degrees.
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