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- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 type Reference @default.
- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 P1144 "2007047393" @default.
- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 P1683 "p.15 / "Geometry Is a Beautiful Subject!" / Blackwell: Oh, there ... / But there ... / ... / I still remember the concept of a *helping line*. You have a proposition that looks quite mysterious. Someone draws a line and suddenly it becomes obvious." @default.
- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 P4970 "helping line" @default.
- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 P50 Q525037 @default.
- 34527eb14cfb71dd32b942c6e7c7f9e1dbbe76f8 P854 books?id=1eHqBgAAQBAJ&pg=PA15 @default.