If the angles, in degrees, of a triangle are x, 3x + 20 and 6x, the triangle must be
A.Obtuse✓ Correct
B.Acute
C.Right
D.Isosceles
Explanation
Sum of angles = 180°: x + 3x+20 + 6x = 180 → 10x = 160 → x = 16°. So angles are 16°, 68°, and 96°. Since one angle (96°) is greater than 90°, the triangle is obtuse.
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