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Chas3down
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Homework Statement
A street light is at the top of a pole that is 18 feet tall. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the length of her shadow moving when she is 35 ft from the base of the pole?
Homework Equations
a^2 + b^2 = c^2
b' = 4
The Attempt at a Solution
18/6 relate to
x/(x-35)
I got x = 35/2
so total length of side is 105/2
18^2 + 105/2 ^ 2 = 111/2 ^ 2
2aa' + 2bb' = 2cc'
a' = 0, height of pole never changes
2*35*4 = 111/2 * c'
c' = 420/111
but wrong anwser
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