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Triangles. Classified by their SIDES and by their ANGLES. Triangles Classified by their SIDES. Equilateral : All sides are congruent Isosceles : At least 2 sides are congruent Scalene : None of the sides are congruent. Triangles Classified by their ANGLES.

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triangles

Triangles

Classified by their SIDES and by their ANGLES.

triangles classified by their sides
TrianglesClassified by their SIDES
  • Equilateral: All sides are congruent
  • Isosceles: At least 2 sides are congruent
  • Scalene: None of the sides are congruent
triangles classified by their angles
TrianglesClassified by their ANGLES
  • Acute: all 3 angles are acute angles
  • Obtuse: 1 obtuse angle (leaving 2 acute angles)
  • Right: 1 right angle (leaving 2 acute angles)
quadrilaterals

Quadrilaterals

4-sided figures

parallelogram
Parallelogram
  • Opposite sides are congruent
  • Opposite sides are parallel
rectangle
Rectangle
  • Opposite sides are congruent
  • Opposite sides are parallel
  • 4 right angles
square
Square
  • Opposite sides are congruent
  • Opposite sides are parallel
  • 4 right angles
  • 4 congruent sides
rhombus
Rhombus
  • Opposite sides are congruent
  • Opposite sides are parallel
  • 4 congruent sides
trapezoid
Trapezoid
  • One pair of parallel sides
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