GCSE Secondary Maths Age 13-17 - Algebra: Cosine Rule - Explained

The video tutorial explains how to prove that line AC is equal to line BD in a quadrilateral ABCD, where AB equals CD and angle ABC equals angle BCD. The teacher separates the quadrilateral into two triangles, ABC and BCD, to demonstrate congruency using the side-angle-side condition. By proving the triangles congruent, it is concluded that AC equals BD. The tutorial also highlights the importance of identifying common elements and reviews the four conditions of congruency.

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