There are couple of topics covered in this section:

1. Circles

2. Triangles

Click on each topic to know more details.

Circles

Key topics include:

- Basic Definitions
- Circle
- Chord
- Congruent Chords
- Segment
- Major, Minor & Semi Circle Segment
- Arcs
- Major and Minor Arcs
- Sector
- Major & Minor Sectors
- Secant
- Tangent
- Point of Contact
- Number of Tangents to a Circle

- Theorems on Tangents

Triangles

Key topics include:

- Introduction
- Congruent Figures
- Similar Figure
- Similar Polygon

- Thales’s Theorem
- Thales Theorem (Theorem 1)
- Converse of Thale’s Theorem (Theorem 2)

- Mid Point Theorem
- Mid Point Theorem (Theorem 3)

- Angle Bisector Theorem
- Angle Bisector Theorem (Theorem 4)

- Criteria for Similarity of Two Triangles
- AAA Similarity (Theorem 1)
- SSS Similarity (Theorem 2)
- SAS Similarity (Theorem 3)
- Altitude Division of a Right Angled Triangle (Theorem 4)
- Altitude Property (Theorem 5)
- Median Property (Theorem 6)
- Theorem 7 : Angle Bisector Property

- Ratio of the Areas of Two Similar Triangles
- Sides Property (Theorem 1)

- Pythagoras Theorem
- Pythagoras Theorem (Theorem 1)
- Converse of Pythagoras Theorem (Theorem 2)

- Projection Theorem
- Apollonuis Theorem