Algebra and Graphs
Construction and Scale Drawing
Similar Figures and lengths
Similar Figures and Area and Volume
Lines, Planes and Rotational Symmetry
Basic Angle Properties
Sum of Interior and Exterior Angles
What are Loci
Vectors, Matrices and Transformations
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Sum of the Interior and Exterior Angles of a Polygon
In this section I will explain to you what Interior and Exterior Angles are and how to calculate them. Interior Angles are angles on the inside of the polygon while the Exterior Angle lies on the outside. You will learn that the sum the interior angles depends on the amount of sides the shape has. The sum of the Exterior Angles will always equal to 360 degrees regardless the shape! Study the following videos carefully during your maths revision to see why and prepare yourself for your IGCSE GCSE Maths exam.