Parallel and Perpendicular Lines

Get some practise in on finding perpendicular lines!

When it comes to perpendicular gradients, the key rule is that the gradients have a product of -1.

So, this means that if you know one gradient, the perpedicular gradient comes from changing the sign and inverting it - for example, a gradient of 2 is perpendicular to -1/2.

A couple more -

A gradient of -3 is perpendicular to a gradient of 1/3
A gradient of 2/3 is perpendicular to a gradient of -3/2

Still not sure? Take a look at this tutorial from Corbett Maths.

Angle Bisectors and Perpendicular Bisectors

Not sure about how to construct a bisector? Or not sure which one is which? Have a look at these two videos which show you the step-by-step instructions.

Angle Bisectors:

Perpendicular Bisectors:

Got the hang of it? Draw a few lines and angles and get some practice in! You'll need a pencil, ruler and compass for this - make sure you have them.