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(1)90°…CG→BF

(2)45°…EG→AC

(3)30°…平面ABG=平面ABGH、平面EFG=平面EFGH

(4)90°…平面BDH=平面BDHF、平面CEG=平面CAEG

補足:(3){1:2:√3}で{30°60°90°}の直角三角形

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