Find the Radius of the Circle | Geometry Puzzle with Solution

Can you find the radius of this circle? 🟢 This is a fun geometry puzzle involving chords, perpendiculars, and the Pythagoras theorem. In this video, I’ll guide you through the reasoning step by step — but without revealing the complete solution right away, so you can think it through first!

👉 Hint: Start by choosing a point inside the circle. Then, draw two perpendicular lines from that point to the two chords. Use the fact that the radius bisects a chord, and finally apply the Pythagoras theorem to calculate the circle’s radius.

This geometry puzzle is excellent practice for students preparing for math exams, competitive tests, or anyone who enjoys problem-solving challenges.

📌 Try solving it yourself before watching the full explanation, and don’t forget to subscribe to MathSpark for more math tricks and puzzles!

👉 Watch more related geometry puzzles and math tricks here:
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