Respuesta :

199932

Step-by-step explanation:

Sum interior measure of triangle = 180°

Sum interior measure = (n-2)180

Where n is the no. of sides

Sum interior measure = (n-2)180

=(3-2)180

=180°

61+42+x =180

103+x =180

x = 180-103

x = 77°

Good Luck

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