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Questions (1)
When leaned against a vertical structure, a straight ladder can be used safely if its top is no more than 4 above the base of
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Answers (2)
Length of ladder=AC=15m Height of window from ground in first case AB=9m ABC is right angled triangle Ac^2=AB^2+BC^2 BC=12m In second case Let CE be length of ladder=15m Height of window from ground=DE=12m Triangle CDE is a right angled triangle
Cos A= 4(1-(15/17)) cos A= 4(12/17) Cos A= 48/17
