1 General Mental and Psychological Abilities · 1.4.2 Geometry and trigonometry
1.4.2.5 Circles: chords, tangents and angle theorems
Circle questions rest on one right triangle (radius, half-chord, distance from the centre), one angle rule (angle at the centre is twice the angle on the circle), the cyclic-quadrilateral 180° rule, and the tangent facts (tangent ⊥ radius, equal tangents from a point).
- APPSC Group 1
- Advanced level
- 7 min read
- Full course
Key terms
- chord
- perpendicular from centre
- angle at centre
- angle in semicircle
- same segment
- cyclic quadrilateral
- tangent
- tangent length
- alternate segment theorem
- intersecting chords
- secant
- common tangents
- inscribed polygons
What this note covers
- Core factsFoundation
- ExplainedStandard
- DeeperAdvanced
- Common trapsFoundation
- Quick revisionFoundation
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