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Ask a math problem in the second day of junior high school, 53
The root number 6.75 is (1.5√3 or 1.5 times the root number 3).

Three lines in one, passing through the midpoint of the bottom edge (that is, the vertical height of the bottom edge) is the vertical line of the waist.

Get a right triangle, the hypotenuse is 3 cm, and the angle of the three lines is 60 degrees.

Then the trilateral ratio is 1k: 2k: √ 3k.

2k = 3cm

K = 1.5 cm

Distance from the midpoint of the bottom edge to the waist √3k= 1.5√3cm.