In δabc, the sum of the measures of ∠a and ∠b is 47º. what is the measure of ∠c?

The answer is: 133° .

Let us assume you mean to write:  "Δ abc" .

All angles in a triangle add up to 180 degrees; 

so, if:  m∡a  +  m∡b  =  47 ;

then m∡c = 180 − 47 = 133° .

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