Shanghai yimo mathematics

There is no need for classified discussion. Since the special value of the angle is 120, we can quickly get OB=80/sqrt(3)=80sqrt(3)/3, so it is obvious that BH=40+80/sqrt(3), and then the tire height from the ground is BH-BP, BP = 0.5 *.

Note: sqrt means root sign, which is square.

As shown in the figure:

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