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The length of the ramp Tyree will need to make from window to the sidewalk is 5√17 feet .
In the question ,
it is given that ,
height of the window is = 5 feet ,
distance of sidewalk from the Tyree's house is = 20 feet ,
We know that the angle between the wall and the floor is 90° ,
So , the system is making a right triangle ,
let the length of the ramp be = "x" ,
So, According to Pythagoras Theorem ,
we get ,
x² = 5² + 20²
x² = 25 + 400
x² = 425
x = √425
x = 5√17 feet .
Therefore , the length of the ramp is 5√17 feet .
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