Category Archives: A

ABC (Notation)

The shape made by joining the vertices A, B and C. Capital letters are used for each of the vertices.

Note: The number of letters represents how many corners the shape has. ABCD would represent a four sided shape.

Example: Triangle ABC has three marked angles.

🔑Key Shape Notation Topics: Circle Theorems, Geometric Proof, Vectors
👀Also Look up: AB Notation, A Notation, ABC Angle Notation


An angle less than 90o.

🔑 Key Acute Topics: Drawing Angles, Measuring Angles, Angles on Parallel Lines
👀Also Look Up: Obtuse, Reflex, Angle