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Angles in a Semi Circle

Angles in a Semi Circle. What is to be learned. The secret of the angle in a semi circle. How to use this knowledge to calculate lengths and angles. Semi Circle?. Must be diameter!. O. Semi Circle?. Always a Right Angle. O. Semi Circle?. Right Angle (it always will be!). O.

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Angles in a Semi Circle

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  1. Angles in a Semi Circle

  2. What is to be learned • The secret of the angle in a semi circle. • How to use this knowledge to calculate lengths and angles

  3. Semi Circle? Must be diameter! O

  4. Semi Circle? Always a Right Angle O

  5. Semi Circle? Right Angle (it always will be!) O

  6. Semi Circle? Have to identify right angle 250 O 650

  7. using pythag x2 = 52 + 72 Semi Circle? 5cm x O 7cm

  8. Semi Circle? To find angle use trigonometry 8cm x0 O 12cm

  9. Angle in a Semi Circle Always a Right Angle O Diameter

  10. Right Angled Triangles lead to problems on • Pythagoras or • Trigonometry

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