The side length of square ABCD is 7 cm, and there is a triangle bef inside it (as shown in the figure). The line AE = 4 cm, DF = 2 cm, then the area of triangle bef is equal to______ Square centimeter

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• 1. The area of a rectangle is 120 square centimeters. EF is the midpoint of BC and CD respectively. How to calculate the area of the shadow?
• 2. As shown in the figure, it is a square with side length of 6cm. E and F are the midpoint of CD and BC respectively
• 3. In square ABCB, the side length is 1cm, EF is the midpoint of BC and CD respectively, calculate the area of shadow part! Trouble,
• 4. The figure on the right is a square with a side length of 6cm. E and F are the midpoint of CD and BC respectively. Find the area of the shadow in the figure
• 5. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
• 6. As shown in the figure, two identical right triangles are partially overlapped, and the area of the shadow is______ &Square centimeter
• 7. As shown in the figure, a large rectangle is just divided into six small squares, of which the smallest square area is 1 square centimeter, then the area of the large rectangle is () A. 154 square centimeter B. 143 square centimeter C. 132 square centimeter D. 120 square centimeter
• 8. If the area of a square is 9 square units, what is the length unit of the side of the square
• 9. How many different ways are there to make a rectangle out of 48 small squares with a side length of 1cm? How long? How wide? How large is the area? At least six fast
• 10. Several square cards with a side length spell out a new square, write out three answers, and express the area of the new square in different ways How many square cards with side length a can make a new square? Try to write three answers and express the area of the new square in different ways. What can you find from different ways?
• 11. The side length of square ABCD is 7 cm, and there is a triangle bef inside it (as shown in the figure). The line AE = 4 cm, DF = 2 cm, then the area of triangle bef is equal to______ Square centimeter
• 12. In the square with side length 6, there is a triangle bef, and the line segments AE = 3, DF = 2
• 13. As shown in the figure, divide a piece of land into four groups to plant, with the same shape and size (each piece has the same number of points), how to divide it?
• 14. We often see floors with patterns as shown in the figure. They are all made of square shaped materials or hexagonal shaped materials. In this way, the materials can be paved into a flat and void free floor (1) If the floor is paved as above, can it be made of pentagonal materials? Why? (2) Can you come up with another plan to use a polygonal (not necessarily regular polygonal) material to lay the floor? Draw a sketch of your plan. (3) please draw a sketch of two different regular polygon materials
• 15. The section figure of a cube can be several sides Solid geometry of senior two
• 16. If a cube is intercepted by a plane, what kind of figure can't the shape of the cross section be? A square B triangle C trapezoid D circle why?
• 17. What are the shapes of the section of a cube Please complete the answers separately
• 18. What figure might the cross section of a cube be
• 19. What shape pattern might the cross section of a cube be
• 20. How many kinds of unfolded cube without cover are there? Please draw a more detailed picture! Thank you!