As shown in the figure, two identical right triangles are partially overlapped, and the area of the shadow is______ &Square centimeter

10-6 = 4 (CM), (4 + 10) × 12 △ 2 = 14 × 12 △ 2, = 84 (square cm); answer: the area of shadow is 84 square cm

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1. 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
2. If the area of a square is 9 square units, what is the length unit of the side of the square
3. 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
4. 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?
5. How many square pieces of paper 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
6. Cut a 20 cm long wire into two sections, and make a square with the length of each section as the perimeter, then the minimum value of the sum of their areas is
7. Cut a 20 cm long iron wire into two sections, and make a square with the length of each section as the perimeter. To make the sum of the two squares equal to 17 square centimeters, what are the lengths of the two sections?
8. Cut a 20 cm long iron wire into two sections, and make a square with the length of each section as the perimeter. To make the sum of the two squares equal to 17 square centimeters, what are the lengths of the two sections?
9. How many kinds of spelling methods are there? What is the shortest perimeter of a rectangle?
10. How many ways do you spell a rectangle with 12 small squares 1 cm in length? Draw it, and then calculate how many centimeters are the perimeter sides
11. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
12. 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
13. In square ABCB, the side length is 1cm, EF is the midpoint of BC and CD respectively, calculate the area of shadow part! Trouble,
14. 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
15. 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?
16. 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
17. 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
18. In the square with side length 6, there is a triangle bef, and the line segments AE = 3, DF = 2
19. 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?
20. 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