1.

In the evening, the shadow of an object is very long due to the low position of the Sun. A 20m heigh lamp post makes a 99m long shadow. What is the distance from the top of the pole to the top of its shadow?

Answer»

{h}^{2}  =  {l}^{2}  +  {b}^{2} \\  =  >  {h}^{2}  =  {(20)}^{2}  +  {(99)}^{2}  \\  =  >  {h}^{2}  = 400 + 9801 \\  =  >  {h}^{2}  = 10201 \\  =  > h =  \sqrt{10201}  \\  =  > h = 101m

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