SEMICIRCLE ANGLE
CLASS 9 & 10 · MATHS
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REMEMBER∠ in semicircle = 90°
- Known as Thales' theorem
- True for any point on the circle
- Converse: a 90° angle sits on a diameter
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CLASS 9 & 10 · MATHSMove this point anywhere. The angle never changes!
Angle in a semicircle in 25 seconds
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