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A ladder is leaning against a building. When the bottom of the ladder is 9m away from the building, the height that the ladder can reach is 12m. Can you calculate the length of the ladder?
As shown in the figure: ∵ AC = 9m, BC = 12M, ∠ C = 90 °, ab = 92 + 122 = 15m, the length of ladder is 15m
How long does it take for an ant to crawl nine quarters of a minute and nine tenths of a way?
9 / 10 ／ 9 / 25
=9 / 10 × 25 / 9
=2.5 minutes
How many minutes does it take for an ant to crawl forward 9 / 25 meters per minute, 12 meters?
It's urgent! There must be a formula
12 / 9 / 25 = 12 * 25 / 9 = 100 / 3 minutes
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