YouTube on MSN

Using triangle proportionality theorem to prove parallel lines

👉 Learn how to solve for the unknown in a triangle divided internally such that the division is parallel to one of the sides ...
BBC

Geometry and measure

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 ...
BBC

Higher – Calculations using the alternate segment theorem, tangents and chords

It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...