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Mathematical cutting problem
1、

From the title, we can know that cutting two knives into three squares is the two knives shown in the red line in the picture.

So the bottom of a cuboid is square, and its height is three times the length of the bottom.

S length = 2xl 2+lx3lx4 = 126? Get L=3? So s is positive = l 2x6 = 54 (s = rectangular surface area, L= base length of cuboid).

S table =54x3= 162

2. The perimeter from the bottom is18cm, the bottom area is 20cm, c =18cm, and the bottom of s =20?

That is 2x(a+b)= 18 and ab=20, then the two lengths of the bottom are 4 and 5 respectively.

S total = 184=2ab+2h? x9

So h=8

So the volume V=20x8= 160.