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Geometry - Angle sizes and sums in triangles

Angle sizes and sums in triangles

In the following pages we will explore angle sizes and sums in triangles.
Read through the information carefully and use the practice questions to
test your understanding. Let's begin with a historical perspective -
Euclid's method of proof.

Euclid was a Greek mathematician who lived about 300BC. His book
"Elements" sets out all the basic ideas of geometry in logical order, and
has been used ever since in western mathematics. His method of proof builds
up a sequence of basic ideas set out one-by-one. If you accept that the
basic ideas are true, then the conclusion simply has to be true.

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