Google Classroom

GeoGebra Classroom

green & red circles

作者：Maurice OReilly

主題：面積, 圓, Pythagoras or Pythagorean Theorem, 矩形, 正切線或正切

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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