Divide a rectangle 10 cm long and 6 cm wide into four different rectangles and find the sum of the circumference of the four different rectangles

Divide a rectangle 10 cm long and 6 cm wide into four different rectangles and find the sum of the circumference of the four different rectangles

This problem is equivalent to a brain twister
You put four rectangles back together
You will find that the sum of all the girths is the girth of the first large rectangle plus twice the length and twice the width
So the total perimeter (10 + 6) * 4 = 64

The circumference of a rectangle is 36 cm. If the length is reduced by 4 cm and the width is increased by 2 cm, the rectangle will become a square,
Then the equation is?

"Reduce the length by 4cm, increase the width by 2cm, the rectangle will become a square" width = x-4-2
The equation is
(x+x-6)×2=36 X=12

Cut a square with side length of 8 decimeters into two rectangles of the same size. The circumference of each rectangle is () decimeters
A.12 B.24 C.4

It should be B. circumference of rectangle = (length + width) x2 = (8 + 8 △ 2) x2 = 24

How many expansions are there in a cube?

11 species

How many kinds of unfolding drawings are there for a cube?

"A448661442": Hello
I have drawn 21 kinds for reference
The following is a square expansion. Six black squares represent six sides of the square, and white squares represent gaps
(1)
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(2)
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(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(x)
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(11)
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(12)
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(XIII)
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(14)
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(15)
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(16)
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(17)
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(18)
■■□□
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(19)
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(20)
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(21)
■■■□□
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Do you see the law? Good luck. Goodbye

How many kinds of cube expansion?
It's turned over

There are 11 kinds, our teacher just finished today

There are several forms of cube expansion, how to draw

There are 11 forms

There are several kinds of unfolded cube without cover

"Secret 113": the following is the schematic diagram, the black square represents the expanded diagram, and the white square represents the vacancy. (1) □ ■ ■ ■ ■ □ □ (2) ■ ■ ■ ■ ■ ■ □ □ (3) ■ ■ ■ ■ ■ ■ □ □ (4) ■ ■ ■ ■ □ ■ □ □ □ (5) ■ ■ ■ ■ ■ ■ ■ □ □ ■ ■ (6) □ ■ □ □ □ ^ ^ ^ ^

Cube expansion
How to judge whether it is a cube expansion? (except for 11 expansion forms, remember them), and how to know which two faces are opposite? Please tell me the rules of these two problems, which is easy to understand,
-- don't use 11 kinds of fully expanded drawings, but the rules! A certain rule! For example, there is a rule between two squares,

■□□□ ■■■■ ■□□□ ■□□□ ■■■■ □■□□ ■□□□ ■■■■ □□■□ ■□□□ ■■■■ □□□■ □■□□ ■■■■ □■□□ □■□□ ■■■■ □□■□ ■■□□ □■■■ □■□□ ■■□□ □...

Use a plane to cut a cube, the section may be ()
A. Hexagon B. circle C. rectangle D. sector

∵ each face of a cube is a plane, and the edge of the section can only be a line segment, not an arc, ∵ options B and d do not conform to the meaning of the topic, wrong; if you use a plane to cut a cube, the maximum number of sides of the section can only be 6, as shown in the figure, option a does not conform to the meaning of the topic, wrong; when you cut a cube along the diagonal of a certain face of the cube, the section is rectangular As shown in the figure, option C is in line with the meaning of the question, so select C