# Geometry – Grade 10 CBSE

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

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