7 Triangles of Reality

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7 Triangles of Reality

• A Montessori Key Lesson
• By Mid-Michigan Montessori
• (Click your mouse to advance through presentation)

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Classifying Triangles

• Sides
• Angles
• Or both

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Classifying Triangles by Their Sides

• A Triangle has three sides

Side 1
Side 3
Side 2
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Classifying Triangles by Sides

• There are three types of triangles by side
• Equilateral
• Isosceles
• Scalene

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This is an equilateral triangle

• An equilateral triangle has three equal sides.
• Its etymology is Latin
• equi equal lateral sides

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This is an Isosceles triangle

• An isosceles triangle has two equal sides.
• Its etymology is Greek
• equal legs

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This is an Scalene triangle

• An scalene triangle has no equal sides.
• Its etymology is Latin
• ladder

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Classifying Triangles by Their Angles

• A Triangle has three angles

Angle 1
Angle 3
Angle 2
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Classifying Triangles by Angles

• There are three types of triangles by angle
• Right
• Obtuse
• Acute

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This is an right triangle

• All triangles with one square angle are called
  right triangles.
• Or, one corner has a 90º angle.
• Its etymology is Latin
• rectus - straight

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This is an obtuse triangle

• There are no right angles in an obtuse triangle.
• An obtuse triangle has one angle greater than
  90º.
• Its etymology is Latin
• obtusus blunt, dull

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This is an acute triangle

• There are no right angles in an acute triangle.
• An acute triangle has three angles that are all
  less than 90º.
• Its etymology is Latin
• acutus sharp, pointed

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Classifying Triangles by both Sides and Angles
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Mid-Michigan Montessori

• Feel free to use this presentation in your
  classroom as an introduction to triangles.
• Similar presentations can be found at
• www.midmichiganmontessori.Com