The circle geometry problem most students get wrong.

This is a challenging circle geometry problem involving chords and the intersecting chords theorem. At first, the diagram may look complicated, but once you identify the correct relationship between the lines, the solution becomes much easier.

Pause the video, study the diagram carefully and try to calculate the radius before I reveal the answer. In this lesson, I will break down the geometry step by step and explain the reasoning clearly, so you understand how the answer is obtained instead of simply memorising a formula.

Write your answer in the comments before watching the complete solution. Did you solve it correctly?

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