快樂學數學_角度(S)

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快樂學數學_角度(S)

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  1. Types of angles

    Slide 1 - Types of angles

  2. Types of Angles

    Slide 2 - Types of Angles

    • An acute angle measures less than 90°
    • An obtuse angle measures more than 90°
    • A right angle measures exactly 90°
  3. 20°

    Slide 3 - 20°

    • 120°
    • 90°
    • If this angle is acute, what could be its measurement?
  4. Right

    Slide 4 - Right

    • Obtuse
    • Acute
    • Which angle do you see the most on this building?
  5. Obtuse

    Slide 5 - Obtuse

    • Right
    • Acute
    • The hour hand makes an angle with the minute hand. What kind of angle is it?
  6. Draw an obtuse angle in your box.

    Slide 6 - Draw an obtuse angle in your box.

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