Angles and Triangles

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Angles and Triangles
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Angles

• Acute Angle An angle that is less than 90.
• Right Angle An angle that is 90.
• Obtuse Angle An angle that is more than 90.
• Straight Angle An angle that is 180.

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Triangle by sides

• Isosceles Triangle Has 2 sides of equal
  lengths.
• Scalene Triangle All three sides are different
  lengths.
• Equilateral triangles All three sides are the
  same length.

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Triangles by angles

• Right Triangle has one right angle.
• Acute triangle has 3 acute angles.
• Obtuse triangle has 1 obtuse angle.

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How many degrees?

• A square has 4 angles that will total 360.
• A triangle is half a square, therefore ½ of 360
  is 180.
• A triangle will have 3 angles totaling 180.

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