The measures of two angles of a triangle are x and 4x. Which of these expressions represents the measure of the third angle?
A.) 180 + x + 4x B.) 180  x  4x C.) 180  x + 4x D.) 180 + x  4x
Angles of a triangle add up to 180°.
The sum of the two given angles is x + 4x. Therefore, the missing angle would be: 180  (x + 4x) {180° minus the sum of the given angles} = 180  x  4x {distributed negative sign through parentheses} B.) 180  x  4x Ask Algebra House Comments are closed.

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