Sum of angles in a triangle - 180°, Equilateral triangle - All sides and angles are equal, Isosceles triangle - Two sides and two angles are equal, Scalene triangle - No sides or angles are equal, Right-angled triangle - One angle is 90°, Exterior angle of a triangle - Equal to the sum of two opposite interior angles, Median of a triangle - Line joining a vertex to the midpoint of the opposite side, Altitude of a triangle - Perpendicular from a vertex to the opposite side, Acute angled triangle - All angles < 90°, Obtuse angled triangle - One angle > 90°, Longest side in a right-angled triangle - Hypotenuse,

Triangle and its properties for class 7th

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