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Scalene triangle

Scalene triangle. No sides congruent. Isosceles triangle. Two sides equal. Equilateral triangle. All sides equal. Acute triangle. All angles less than 90. Right triangle. Exactly one right angle. Obtuse triangle. Exactly one angle greater then 90. Equiangular triangle.

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Scalene triangle

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  1. Scalene triangle No sides congruent

  2. Isosceles triangle Two sides equal

  3. Equilateral triangle All sides equal

  4. Acute triangle All angles less than 90

  5. Right triangle Exactly one right angle

  6. Obtuse triangle Exactly one angle greater then 90

  7. Equiangular triangle All angles equal 60

  8. Interior angles Angles on the inside of the triangle

  9. Exterior angles Angles on the outside of the triangle

  10. Triangle sum theorem The angles in a triangle add up to 180. <A + <B + <C = 180

  11. Exterior angle sum theorem Two sum of the two remote interior angles equal the exterior angle.

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