The Institute of Agricultural Sciences recommended Yujiang No.1 and Yujiang No.2 as two new species and two kinds of rice to farmers

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• 1. Which soil is suitable for the following plants? 1. Rice 2. Cotton 3. Peanut 4. Millet A. Sandy soil B. Loam soil C. Clayey soil
• 2. As shown in the picture, a triangular piece of land should be evenly divided among farmers a, B and C. If ∠ C = 90 ° and ∠ B = 30 ° and the size and shape of the land obtained by these three farmers are the same, please try to divide it, draw it on the picture and prove it
• 3. How to divide a piece of right triangle land equally among the three farmers of a, B and C. It is a triangle ABC with an angle of B = 30 degrees?
• 4. As shown in the picture, there is a triangular open space with three sides of 20m, 30m and 40m respectively. Now we need to divide it into three parts with an area ratio of 2:3:4 to plant different flowers. Please design a plan and explain your reasons
• 5. Next to the Zhongshan Park under construction, there is a triangular open space with the shape shown in Figure 2. You can divide △ ABC into four triangles with equal area to plant four different kinds of flowers and plants. Please help to draw the planning scheme (at least two kinds) What about that triangle? No rules
• 6. A triangle is divided into two triangles by drawing a line segment through one of its vertices. The sum of the inner angles of one of the triangles is () A. 180 ° B. 90 ° C. uncertainty
• 7. A parallelogram and a triangle have the same area and the same length at the bottom. If the height of the triangle is 6cm, the height of the parallelogram is () cm?
• 8. The bottom of a triangle is 6cm, and the height is 4cm. Enlarge the triangle by 2:1, and the area of the figure is several square centimeters
• 9. Xiao Li's monthly food expenditure is 600 yuan. How much is Xiao Li's monthly total expenditure Support for the elderly 9%, other 10%, culture 20%, food 36%, shopping 2%, water and electricity 15%, health 8%
• 10. A trapezoidal wheat field, 17.4 meters, 4 meters, the area is 391 square meters, its bottom is how many meters? One more by the way The floor of a house is paved with square bricks. 270 square bricks with a side length of 0.4 meters are needed. How many square bricks do you need if you use square bricks with a side length of 0.3 meters instead? I'll finish the answer tomorrow, otherwise I won't give any points
• 11. The area of the first experimental field is 100 square meters more than three times that of the second one. The two experimental fields have a total area of 2900 square meters. What are the area of the two experimental fields
• 12. The area of the first experimental field is 100 square meters more than three times that of the second one. The two experimental fields have a total area of 2900 square meters. What are the area of the two experimental fields
• 13. Divide any triangle into four triangles of equal area by three different methods
• 14. As shown in the figure, the shape of a test field is a triangle (let it be △ ABC). The administrator starts from a point D on the side of BC, walks a circle in the direction of DC ﹥ Ca ﹥ ab ﹥ BD, and comes back to D. then the administrator starts from the starting point to the original place and returns to the original place on the way () A. Turn 90 ° B. turn 180 ° C. turn 270 ° D. turn 360 ° C
• 15. The area of a triangle is half the area of a parallelogram, right?
• 16. Can any two identical triangles form a parallelogram
• 17. Two triangles with equal base and height may not form a parallelogram______ (judge right or wrong)
• 18. The area and height of a triangle and a parallelogram are equal. The bottom of a triangle is 3 meters. How many meters is the bottom of a parallelogram?
• 19. The bottom and height of a parallelogram are 1.6m, and its area is______ M2, and the area of the triangle with the same base and height is m2______ m2．
• 20. The bottom of a parallelogram is 20 cm and the height is 16 cm. What is the area of the largest triangle drawn inside?