👉 Learn how to prove that two triangles are congruent. Two or more triangles are said to be congruent if they have the same ...

Learn all about the trigonometry of right triangles. A right triangle is a triangle that has 90 degrees as one of its angles.

Angles inside regular polygons can usually be calculated by splitting the polygon into triangles around the centre. Split the regular pentagon into triangles. Each angle at the centre is \(72^\circ\) ...

Revise the different types of angles and rules for calculating angles. This guide includes interactive activities and a quiz. NEW: Angles in parallel lines Revise alternate, correspondent or ...