I'm reading Randall Munroe's book How To: Absurd Scientific Advice for Common Real-World Problems. I probably don't have to tell you this, but it's awesome (as is everything from Randall Munroe, the ...

The sum of interior angles in a quadrilateral is 360°. This fact is a more specific example of the equation for calculating the sum of the interior angles of a polygon: \(\text {Sum of interior angles ...

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 ...