The angle which is four times of its supplement is _____.
If the angles of a triangles are in the ratio 3:5:7 .The triangles is_____.
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1) Let the angle be x .
So, it's supplement = 4x
Therefore, x + 4x = 180°
=> 5x = 180°
=> x = 36°
Thus, 4x = 3×36 = 144°
2) Let the angles be 3x, 5x and 7x
According to angle sum property,
3x + 5x + 7x = 180
=> 15x = 180
=> x = 12
Thus, angles are :-
3x = 36°
5x = 60°
7x = 84°
Since, none of the angles is equal, the triangle is scalene.
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