The side length of a square paper is 12 cm. Cut a rectangle 4 cm in length and 3 cm in width from its side. What is the circumference of the remaining figure Write the formula

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1. A rectangular piece of paper is 19 cm long and 12 cm wide. Cut off the largest square, and what is the circumference of a small rectangle Such as the title, urgent
2. Put some 20 cm long and 12 cm wide rectangular paper into six layers (as shown in the figure below). What is the circumference of the figure? The figure is one on the first layer, two on the second layer, three on the third layer, four on the fourth layer, five on the fifth layer and six on the sixth layer. What is the circumference of the figure?
3. The side length of a piece of square paper is 12 cm. Cut a rectangle 4 cm long and 3 cm wide on one side of it (the sides of the rectangle are parallel to the sides of the square respectively). How many centimeters is the perimeter of the remaining figure after cutting? Thank you
4. As shown in the figure, the side length of a square is 12 cm. Draw semicircles with four sides as diameters to form a four leaf graph. Find the perimeter of the four leaf graph
5. As shown in the figure, the perimeter of square a is 24 cm, and that of square B is 12 cm. What is the perimeter of the figure made up of a and B?
6. As shown in the figure, the side length of the square is 4cm, and one side is the diameter. Draw four semicircles respectively to find the area of the four leaf pattern
7. A square with a side length of 10 cm is used to draw a semicircle with four sides as the diameter. What is the area of intersection of these four arcs?
8. For a square with side length of 12 cm, draw a semicircle with the diameter of four sides. What is the area of the shadow part surrounded by these four arcs?
9. Divide a circle into several parts evenly and form an approximate rectangle. The perimeter of the rectangle is 8 cm longer than that of the circle. What is the area of the circle______ Square centimeter
10. Given 2 ^ a · 3 ^ B = 216, where a and B are natural numbers, find the value of a ^ 2 · B ^ 3
11. The side length of a square paper is 12 cm. After cutting a rectangle 4 cm long and 3 cm wide from the side, what is the circumference of the remaining paper Hurry up It's better to write out the process of solving the problem and what you think, otherwise, you don't understand! Ah, ah, ah!
12. A rectangle is 10 cm in length and 6 cm in width. If you cut out the square with 1 cm in side length from its four corners, what is the circumference of the remaining figure?
13. If one side of an isosceles triangle is 6cm long and the other side is 2cm long, what is its perimeter?
14. An isosceles triangle has two sides, 3cm and 7cm respectively. The circumference of this triangle is______ ．
15. ① The part of any two points on a straight line is called (). ② an isosceles triangle has two sides, 3cm and 7cm long respectively, and its circumference is () cm ① The part of any two points on a straight line is called () ② An isosceles triangle has two sides, 3cm and 7cm in length, and its circumference is () cm If you don't understand the problem, find the formula
16. One side of an isosceles triangle equals 7cm, one side equals 3cm, and its circumference is () cm
17. If the circumference of an isosceles triangle is 13 and one side is 3cm, then the three sides of the isosceles triangle are () If the circumference of an isosceles triangle is 13 and one side is 3cm, then the three sides of the isosceles triangle are ()
18. If both sides of an isosceles triangle are 3cm and 7cm in length, then its circumference is______ cm．
19. If the lengths of two sides of an isosceles triangle are 3cm and 4cm respectively, what are the lengths of the other side and the circumference of the isosceles triangle
20. An isosceles triangle is 6cm long on one side and 4cm long on the other side