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Ans 6 : According to the question
3x + 4x + 5x = 180°
12x = 180
x = 180/12
= 15°
Angle of 3x = 3 × 15 = 45°
Angle of 4x = 4 × 15 = 60°
Angle of 5x = 5 × 15 = 75°
Ans 7 : According to the question
120 + x + x = 180°
120 + 2x = 180°
2x = 180 - 120
2x = 60°
x = 60/2
= 30°
Since, Two sides are equal so the two side are of 30° angle.
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