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A lighthouse is 10 m high and is situated on a vertical cliff which is 70 m above sea-level.The beam of light from the is 192 m from the foot of the cliff.how long is the beam of light at that instant?

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The beam length b is

b^2 = 192^2 + (70+10)^2

b^2=192^2+(70+10)^2
b^2=b^2/^2=80/^2
x=40m

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