anglesandtriangles

Introducing angles and triangles

geometryanglestriangles
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anglesandtriangles

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Introducing angles and triangles
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Slide Content
  1. Angles and Triangles

    Slide 1 - Angles and Triangles

  2. Angles

    Slide 2 - Angles

    • A shape formed by two rays sharing a common endpoint; contains two rays and a vertex
    • ray
    • ray
    • vertex
    • ray—has one endpoint and goes infinitely in one direction
    • vertex—point common to two rays of a triangle or two sides of a polygon
  3. Types of Angles

    Slide 3 - Types of Angles

    • Acute angle: An angle whose measure is greater than zero degrees and less than 90 degrees
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  4. Types of Angles

    Slide 4 - Types of Angles

    • Right angle: Angle that measures 90 degrees
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  5. Types of Angles

    Slide 5 - Types of Angles

    • Obtuse angle: One angle measures greater than 90 degrees and less than 180 degrees
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  6. Straight Angle

    Slide 6 - Straight Angle

    • Straight angle: A line that goes infinitely in both directions and measures 180 degrees
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    • This is a ray. It only goes in one direction.
  7. Types of Triangles

    Slide 7 - Types of Triangles

    • Equilateral triangle: A triangle with three congruent (equal) sides and three equal angles
    • These marks indicate equality.
  8. Types of Triangles

    Slide 8 - Types of Triangles

    • Isosceles triangle: A triangle with at least two congruent (equal) sides
  9. Types of Triangles

    Slide 9 - Types of Triangles

    • Right triangle: Has only one right angle (90 degrees)
    • This box indicates a right angle or a 90-degree angle.
  10. Types of Triangles

    Slide 10 - Types of Triangles

    • Scalene triangle: A triangle that has no congruent (equal) sides
  11. Interior Angles

    Slide 11 - Interior Angles

    • Interior angles: An interior angle (or internal angle) is an angle formed by two sides of a simple polygon that share an endpoint
    • Interior angles of a triangle always equal 180 degrees.
  12. Measuring Angles

    Slide 12 - Measuring Angles

    • You measure angles with a protractor.
    • This point goes at the vertex of the angle
    • This point is 0
    • This point is 0.
    • Notice there are two scales. Be careful which 0 you start at.
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