Topic explanation

Standard explanation

An auxiliary circle based on the sum of radii helps construct common tangents that cross between two circles.

Key points

• constructing transverse common tangents
• understand the idea
• apply it carefully
• keep the ideas separate
• Constructing Transverse Common Tangents: An auxiliary circle based on the sum of radii helps construct common tangents that cross between two
• WHAT — CONSTRUCTING TRANSVERSE COMMON TANGENTS: An auxiliary circle based on the sum of radii helps construct common tangents that cross between two
• HOW — Use the idea: Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check
• CORE UNDERSTANDING: An auxiliary circle based on the sum of radii helps construct common tangents that cross between two

Labelled diagram