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green & red circles
Author:
Maurice OReilly
Topic:
Area
,
Circle
,
Pythagoras or Pythagorean Theorem
,
Rectangle
,
Tangent Line or Tangent
GeoGebra
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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