メインコンテンツ | サブコンテンツ | ||||
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regain00 | The concept of "Is the useless one useless?"
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regain01 | Isosceles triangle and the length of parallel segments
| Origical theorem | If not segment BC but line BC | If not isosceles triangle | |

regain02 | Inscribed angle
| Starting point | Two results | What relationship? | It becomes quadrangle when showing two results at the same time |

regain03 | The length of median
| Starting point | Parallelogram and so on | Triangle | Two triangles? |

Two triangles? | Trapezoid | How about this? | Hint : looking back | ||

Hint |