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Mathematics 7 Online
OpenStudy (anonymous):

In a triangle, the second angle is twice the measure of the first, and the third angle is three times the measure of the second. Find the measure of the third angle.

imqwerty (imqwerty):

let the 1st angle be x 2nd angle =2x 3rd angle =6x x+2x+6x=180 9x=180 x=20

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