Circle Theorems

Circle Theorems

1. 1. The angle at the centre of a circleis twice the angle at the circumference.

2. 2. Angles in the same segment are equal. Opposite angles add up to 180 degrees.

3. 3. The angle in a semicircle is 90 degrees where it hits the circumference.

4. 4. Opposite angles in a quadrilateral add up to 180 degrees

5. 5. A tangent and radius meet at 90 degrees

6. 6. Tangents from the same point are the same length.

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