Finding the equation of a straight line:

More difficult example of finding the equation of a straight line:

Finding the distance between 2 points on a line:

Find the equation of a perpendicular bisector (using mid-points and normals):

Intersection of 2 lines:

How to use trigonometry for right angle triangles:

How to use the sine rule:

How to use the cosine rule:

A past paper question on using sine and cosine rules:

Another past paper question using sine and cosine rule:

A past paper question on 3D geometry:

A fantastic revision video on the whole of geometry and trigonometry: