This worksheet will help learners practice using the circle theorems “opposite angles in a cyclic quadrilateral add to 180 degrees” and “the angle in a semicircle is 90 degrees” along with the theorems covered in Circle Theorems (A). Section A provides some straightforward diagrams with missing angles to find. Section B then increases the complexity of the diagrams and changes the type of angle notation used. Follow on from this worksheet with Circle Theorems (C).
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