A ladder 15m long rests against a vertical wall .if the foot of the ladder is 12m away from the wall how far up the wall is the ladder?
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H² = P² + B²
B² = 15²- 12²
= 225 - 144
= 81 m
B = √81 = 9
so ladder is 9m away
B² = 15²- 12²
= 225 - 144
= 81 m
B = √81 = 9
so ladder is 9m away
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