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おうぎ形の利用 Calculate the area of the black region.

Author:okyota

Topic:Angles, Area, Arithmetic, Circle, Congruence, Constructions, Equilateral Triangles, Geometry, Mathematics, Plane Figures or Shapes, Pythagoras or Pythagorean Theorem, Right Triangles, Rotation, Square, Symmetry, Triangles

黒色の部分の面積を求めなさい。ただし，△EBC＝S とします。

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