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Circle Theorems
- Theorems involving subtended angles
- Angles subtended on the same arc are equal.
- Angle Subtended by a diameter is a right angle
- Angles at centre is double the angle at the
circumfrences
- Angles subtended on the same arc are equal.
- Cyclic Quadrilaterals
- The sum of the opposite angles of a cyclic quadrilateral is 180
degress
- The sum of the opposite angles of a cyclic quadrilateral is 180
degress
- Tangents and Chords
- A tangent to a circle is perpendicular to the radius.
- Tangents to a circle froman external point ot the points of
contact are equal in length.
- The line joining an external point to the centre of the circle bisects
the angle between the tangents
- A tangent to a circle is perpendicular to the radius.
- Alternate Segment Theorem
- The angle between a tangent and a chord is
equal to the angle in the alternate segment.
- The angle between a tangent and a chord is
equal to the angle in the alternate segment.
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