As shown in the figure, there is rectangular paper ABCD, ab = 6, BC = 8, fold the paper along EF, make point B and point d coincide, and calculate the length of crease EF
7.5 see figure
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- 1. As shown in the figure, after folding one side DC of isosceles trapezoid ABCD along EF, make points D and C fall at d ', C', respectively. If ∠ BFC '= 20, then ∠ EFB has more degrees
- 2. As shown in the figure, fold one corner of triangle paper ABC, and the crease is EF. If ∠ a = 80 °, B = 68 ° and CFE = 78 °, calculate the degree of ∠ CEF
- 3. As shown in the figure, in rectangular paper ABCD, fold it as shown in the figure, and the crease is EF. If the angle EFB = 65 degrees, calculate the degree of angle AED Picture:
- 4. How high is Pingxiang from sea level?
- 5. Taking the sea level as the starting point, the vertical distance of a place on the ground above the sea level is called ()
- 6. 1. The distance of sea level at a certain place is called elevation 2. The concept of orientation is applicable to any place on the earth
- 7. Are all the sea levels on earth the same distance from the center of the earth? I was thinking, if it's not the same, what's the altitude
- 8. What is the distance between the sea level and the earth's center? Is the sea level at the equator the same as that at the North Pole? We are used to saying that there is a unified altitude of 0 in the world. What is the distance between the altitude of 0 and the center of the earth, So can the distance between point a and the geocenter be calculated by X + the distance from 0 to the geocenter? Can the distance between point B and the geocenter be calculated by X + the distance from 0 to the geocenter?
- 9. 3、 When the height of the terrain is indicated on the map, the sea level should be taken as the datum. Generally, the altitude of the sea level is set at 00, and the elevation of the sea level is set at 0 The number represents the altitude above sea level (1) What is the significance of the altitude of 500 m in Jiadi? (2) What is the significance of the altitude of - 300m in place B? 2. According to the weather forecast one day this year, the lowest temperature in Harbin is - 22 degrees, and the lowest temperature in Haikou is 15 degrees. How much higher is the temperature in Haikou than that in Harbin?
- 10. The altitude of sea level is not uniform. What is the base of altitude?
- 11. As shown in the figure, fold the rectangular piece of paper ABCD so that point a coincides with point C, the crease is EF, and ∠ BFC = 65 °, then ∠ bec=
- 12. How to make a 30 degree angle when the rectangular paper is folded twice
- 13. Fold a piece of rectangular paper as shown in the figure, where ∠ 1 = 30 ° do you know how many degrees ∠ 2 equals?
- 14. Help me out three math problems of grade one in junior high school, about folding a corner on a piece of paper and finding the degree of one of the corners, which is similar to this one
- 15. How to make 30 ° and 60 ° angles with a rectangular piece of paper?
- 16. How to make a 30 degree angle with any rectangular paper? Do not use any tools (except hands)
- 17. How to make a 75 degree angle with a rectangular piece of paper
- 18. How to read the Tropic of cancer 23 ° 26 ′ n We are going to take the monthly exam
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