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How to use the congruence of parallel lines to determine the missing value

👉 Learn how to solve for an unknown measure using parallel sides. When two parallel lines are cut by a transversal, there ...
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Higher – Calculations using the alternate segment theorem, tangents and chords

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 ...