If you use a small square with a side length of 1cm to build the following tower shape, then the perimeter of the shape built for the nth time is______ Cm (expressed in an algebraic expression containing n)

If you use a small square with a side length of 1cm to build the following tower shape, then the perimeter of the shape built for the nth time is______ Cm (expressed in an algebraic expression containing n)

The first time: when there is a small square, the perimeter is equal to the perimeter of a square, which is 1 × 4 = 4; the second time: when there are three small squares, a total of four sides are covered, which is equivalent to the lack of the perimeter of a small square, and the perimeter of the figure is 2 × 4 = 8; the third time: when there are six small squares, a total of 13 sides are covered, which is equivalent to the lack of 3 The perimeter of three small squares is 3 × 4 = 12 Find the rule, the nth time: the perimeter of the graph built several times is equivalent to the perimeter of several small squares, which is n × 4 = 4N. So the perimeter of the nth graph is 4N

If the visual picture of a plane quadrilateral is a square with side length a, the area of the original plane quadrilateral is equal to ()
A. 24a2B. 22a2C. 22a2D. 223a2

According to the rule of drawing the visual graph of a plane graph by oblique dichotomy, the relationship between the area s of a plane graph and the area s' of its visual graph is s' = 24s. The area of the visual graph in this question is A2, so the area of the original plane quadrilateral is equal to a224 = 22a2

When drawing a direct view with oblique two side drawing method: ① the direct view of a triangle is a triangle; ② the direct view of a parallelogram is a parallelogram; ③ the direct view of a square
When using oblique two side drawing method to draw a visual picture:
① The visual graph of a triangle is a triangle
② The visual image of a parallelogram is a parallelogram
③ The visual image of a square is a square
④ The visual image of a diamond is a diamond
The above conclusions are correct: why?
I'm urgent, super urgent

I think the first one and the second one are right. Come on!