The Maths Habit

Circle theorems: the angle in a semicircle

Circle theorems · Higher · 6:24

Worksheet (PDF) Answers (PDF)

Chapters

  1. 0:00Introduction
  2. 0:30Do Now
  3. 1:26Why the angle is 90°
  4. 2:11Spotting the diameter
  5. 2:51Example 1: angles in a triangle
  6. 3:26Example 2: radii make an isosceles triangle
  7. 4:06Your turn
  8. 4:42Common mistake
  9. 5:17Worksheet and exit question

Practise circle theorems for 15 minutes a day in The Maths Habit, on your phone or in your browser.

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