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Rules of circles
Terminology related to circles is outlined. It is stated that any triangle drawn in a semi-circle will be right-angled. This is used to demonstrate how to find a missing angle in a semi-circle. Pythagoras theorem can be used to find a missing side of the triangle. It is also demonstrated that a triangle with two sides made by a radius and a tangent will also be right-angled. A further triangle is made between two radii. This isosceles triangle is bisected into two right-angled triangles and the length of the chord between the radii is calculated.
Use as a a specific introduction or recap on triangles and angles related to circles. Use to reinforce understanding of the terms used and to provide examples of the types of calculations students may be required to carry out.
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