Circle Theorems

Circle Theorems

1. Angles formed by drawing lines from the ends of the diameter of a circle to its circumference form a right angle.

2. Angles in a cyclic quadrilateral ad up to 180 degrees

3. Tangents form a right angle at the radius

4. Area of sector = πr2 × A/360

5. Alternate segment theorem

6. Angles formed from two points on the circumference are equal to other angles, in the same arc, formed from those two points

7. Theangle a the centre is half the angle at the circumfrence

8. Arc length = 2πr × A/360

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