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100 POINTS! Can someone please help me solve this? before 11:59pm.

100 POINTS! Can someone please help me solve this? before 11:59pm.-example-1

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The Sine or Sin(0) in a right angle triangle is the ratio of its perpendicular to its Hypotenuse. The Height on the wall till which the ladder reaches is 21.148 ft.
User Allen Chou
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