so please this question
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4) 3x+4x+5x=180°
12x=180°
x=180/12
x=15
3x=45°,4x=60°,5x=75°
5)20x+5x+11x=180°
36x=180°
x=5
20x=100°,5x=25°,11x=55°
scalene triangle
6)1x+2x+3x=180°
6x=180°
x=30
2x=60°
3x=90°
it is a right triangle
12x=180°
x=180/12
x=15
3x=45°,4x=60°,5x=75°
5)20x+5x+11x=180°
36x=180°
x=5
20x=100°,5x=25°,11x=55°
scalene triangle
6)1x+2x+3x=180°
6x=180°
x=30
2x=60°
3x=90°
it is a right triangle
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