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Triangle Vocabulary

AB
Triangle, 3 sides, 3 angles
180°3 angles in triangle always add up to this
Straight angleIs always 180°
Equilateral triangle, 3 equal sides, 3 equal angles, always 60°
Isosceles triangle, 2 equal sides, 2 equal angles
Scalene triangle, No equal sides, no equal angles
Acute triangle, All angles are less than 90°
Right triangle, Has a right angle (90°)
Obtuse triangle, Has an angle greater than 90°
Right scalene triangle, Has a right angle (90°) and no equal sides or angles
Right isosceles triangleHas a right angle (90°) and 2 equal angles (45°) and 2 equal sides
Obtuse scalene triangle, Has an angle <90° and no equal sides or angles
Obtuse isosceles triangle, Has an angle >90° and two equal sides
Acute scalene triangle, Has all angles <90° and no equal sides or angles
Acute isosceles triangle, Has all angles <90° and two equal sides


The Village School
Houston, TX

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