Respuesta :

Answer:

x = 10°

Step-by-step explanation:

99° + 3x + 12° + 39° = 180° {Being sum of angles of triangle }

150° + 3x = 180°

3x = 180° - 150°

3x = 30°

x = 30°/ 3

x = 10°

Hope it will help :)❤

Answer:

in triangle

99+39+3x+12=180 sum of interior angle of the triangle is 180

3x=180-150

x=30/3=10

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