The point below e is set to H.

Take the midpoint of the GH line? Connect the midpoint with p? And extend to both sides? Is the line l

The tangent value should be 1.5.

Figures with the same color in the figure have the same area, so the left and right sides of the dividing line have the same area. The point is, if the areas of two yellow triangles are equal, it must be the midpoint of GH.

You can understand the idea of the first question.

Step 1: draw a square consisting of red, blue and green with point P, and draw it in equal parts by L.

Step 2: Solve how to divide the blue, pink and yellow figures equally. Because the two blue squares are the same, how to divide the two pink figures equally is the key.

Step 3: Find the midpoint of two pink midlines. Because this point is also a line, any drawing will be equally divided, so find a line that can equally divide two pink squares and the red, green and purple squares above, which is L.

Then, the tangent is calculated as follows:

Just calculate the tangent of the yellow triangle.

The base of the yellow triangle is set to a, the vertical side is half of the cube, and the side length is set to R.

Then r ÷ a = 4r ÷ (a+2r).

It can be calculated that the ratio of R to A is 3:2.

Then the tangent of the angle should be 3:2, which is 1.5.