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Mathematics 21 Online
OpenStudy (anonymous):

The figure below shows a bamboo structure.

OpenStudy (anonymous):

What is the length of NB? Show all the steps you used to find your answer.

OpenStudy (phi):

This is a well-known (famous) picture. All 3 triangles (the big outer one, and the 2 inside ones) are similar. Also, you can use pythagoras to find side CN. after which you set up a ratio of NB/CN as CN/AN and solve for NB

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