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| (i) If one angle of a triangle is a right angle, then it is called a right angled triangle. Note that the other two angles are acute. |
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| (ii) If all the angles of a triangle are acute, then it is called an acute angled triangle. |
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| (iii) If one angle of a triangle is obtuse, then it is called an obtuse angled triangle. Note that the other two angles are acute. |
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