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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