Perpendicular, Lines meeting at a right angle, Scalene, Triangle with all sides and angles different, Obtuse, Angle above 90 degrees, below 180 degrees, Acute, Angle below 90 degrees, Reflex, Angle above 180 degrees, less than 360, Equilateral, Triangle with equal length sides and equal angles, Isosceles, Triangle with two sides the same, Angle, Measurement of a turn, Triangle, Three-sided shape.

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