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?
15 × 15 △ 2 × 4 = 450 (square centimeter), 450-20 × 20 = 50 (square centimeter); answer: the area of a small square is 50 square centimeter
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- 1. 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
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- 3. 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
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- 12. A circle has the largest square in it. The diameter of the circle is 20 cm. Find the area of the square
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- 14. If the height of a cuboid is increased by 2cm, it will become a cube. The surface area will be increased by 64cm. What is the volume of the cuboid?
- 15. When the height of a cuboid increases by 2cm, it becomes a cube. At this time, the surface area increases by 56 square centimeters. What is the volume of the original cuboid? Attach the formula and explanation
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