Triangle Sum Theorem
Name: __________________________________________
Determine the measure of the indicated angle.
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Solve for x.
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Determine the measure of the missing angles.
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19) The three angles of a triangular board have a sum of 180°. The largest angle measures 120° and the
smallest angle measures z°. Which expression could not be used to determine the measure of the third angle?
(A) 180 – 120 – z
(B) 180 – (120 + z)
(C) 60 – z
(D) 180 – 120 + z