Circular Pipe
A surveyor places 100 cm stick against the base of a large circular underground pipe
and finds that the midpoint of the stick is 8 cm from the pipe wall. Find the inside diameter of the pipe, to one decimal place in centimeters.
Diagram not drawn to scale.
The answer is 320.5.
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r^2=(r-8)^2+(50)^2......solve it for r..