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  • Brainly User
2016-02-08T14:22:35+08:00

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First angle: 3x
second angle: 4x
third angle: 5x
Total measure of interior angles of a triangle = 180°

Equation:
     3x + 4x + 5x = 180

     12x = 180
   
     12x/12 = 180/12
   
     x = 15

Plug-in 15 to x:
First angle: 3(15) =  45°
Second angle: 4(15) = 60°
Third angle: (5(15) = 75°

ANSWER:  45°, 60°, and 75°
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