In the figure, it is known that the area of the blank part in the parallelogram is 77 square centimeters, and the area of the shadow part is 16 wide and 7 high

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• 1. The lengths of two sides of an isosceles triangle are 4cm and 6cm, respectively
• 2. An isosceles triangle is 6cm long on one side and 4cm long on the other side
• 3. 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
• 4. If both sides of an isosceles triangle are 3cm and 7cm in length, then its circumference is______  cm．
• 5. 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 ()
• 6. One side of an isosceles triangle equals 7cm, one side equals 3cm, and its circumference is () cm
• 7. 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
• 8. An isosceles triangle has two sides, 3cm and 7cm respectively. The circumference of this triangle is______ ．
• 9. If one side of an isosceles triangle is 6cm long and the other side is 2cm long, what is its perimeter?
• 10. 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?
• 11. As shown in the right figure, the area of the shadow part in the quadrilateral accounts for 16% of the area of the circle and 15% of the area of the quadrilateral; the area of the shadow part in the triangle accounts for 19% of the area of the triangle and 18% of the area of the circle______ ．
• 12. There is a rectangular sheet of iron 30 cm long and 20 cm wide, which is cut from each of the four corners with a side length of 5 cm to make an open iron box. What is the surface area of the box? I want the formula
• 13. A piece of iron wire can be folded into a rectangle of 30cm and 20cm in width. If the iron wire is folded into a square, what is the side length and area of the square?
• 14. If the side length is reduced by 2 cm, then the area is reduced by 28 square cm. How much is the area of the original square Can there be a formula that they can understand
• 15. A square piece of paper with side length of 20 cm is cut down from the top 5 cm along the 45 ° angle to form a small square in the middle to calculate the area of the small square
• 16. There are two squares with side length of 20 cm, one of which has a vertex in the center of the other. What is the area of the overlapping part of the two squares
• 17. A piece of square paper with a side length of 20 cm is cut at a 45 degree angle 5 cm from the top (as shown in Figure 5), and a small square is formed in the middle. What is the area of the small square?
• 18. A piece of square paper with a side length of 20 cm is cut at a 45 degree angle 5 cm from the top (as shown in Figure 5), and a small square is formed in the middle. What is the area of the small square?
• 19. A circle has the largest square in it. The diameter of the circle is 20 cm. Find the area of the square
• 20. When the height of a cuboid is reduced by 2cm, it becomes a cube, and the surface area is reduced by 48cm2. What is the volume of the original cuboid?