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GeoGebra Lesson

green & red circles

Author:Maurice OReilly

Topic:Area, Circle, Pythagoras or Pythagorean Theorem, Rectangle, Tangent Line or Tangent

Move pink cross. Observe, describe, estimate, measure, conjecture. What depends on what? Apply Pythagoras ... It the pink cross has coordinates

, then the radius of the red circle is

. Check this ...

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