1, a building behind a large garden in the garden close to the building have a greenhouse, the greenhouse is rectangular, stretching from the garden, 2 meters wide and three meters high. Greenhouse above the sill of the building. Cleaners cleaning the window sill around, starting a ladder across the greenhouse, a garden, one leaning against the walls of the building. Because the greenhouse is not to the ladder under pressure, so the ladder is too short is not enough. Cleaners are now only a long ladder of seven meters, and you think it will meet the requirements? To meet the requirements of the minimum length of the ladder is how much?

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