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Please design three isosceles triangles of different shapes, so that it can be divided into two small isosceles triangles by a straight line, draw the divided figure and scale it
45 45 90
72 72 36
36 36 108
An L-shaped graph is composed of three small squares on the left and one small square on the right. How to design a centrosymmetric graph?
The square on the top left is placed on the square on the right, which is a large square with symmetrical center
Rectangles, squares, parallelograms and isosceles triangles are all axisymmetric figures
Wrong
Rectangle, square, parallelogram, equilateral triangle and circle are all axisymmetric figures. Right or wrong?
No
A parallelogram is a center to center figure, not an axisymmetric figure
Isosceles triangle, equilateral triangle, rectangle, square, isosceles trapezoid and circle have several axes of symmetry
1 3 2 4 1 innumerable
How do equilateral triangles, isosceles triangles, isosceles trapezoids, squares and rectangles represent their axes?
How to use words to express, for example: line segment - the line where the vertical bisector of the line segment is located
There are three symmetrical axes of equilateral triangle, which are vertical bisectors of three sides;
There is one symmetry axis of isosceles triangle, which is the vertical bisector of the bottom;
There is one axis of symmetry of isosceles trapezoid, which is a straight line passing through the midpoint of two bottoms;
There are four symmetrical axes of the square, which are the straight line passing through the midpoint of the opposite side and the straight line where the two diagonal lines are located;
There are two opposite axes of a rectangle, which are straight lines passing through the midpoint of the opposite side
Note: the axis of symmetry of a graph is a straight line, which can not be said to be a line segment or a ray. In addition, there are some mistakes in your example of "line segment - the line where the vertical bisector of a line segment is located". The vertical bisector of a line segment itself is a straight line, so there is no need to emphasize "the line in which it is located", and one less line: the line in which the line segment itself is located
Which figure, square, isosceles triangle, circle or rectangle, has the least axis of symmetry?
fast
Isosceles triangle has the least axis of symmetry
Rectangle, square, regular triangle, isosceles trapezoid and circle each have several axes of symmetry
Length 2
Countless circles
Equilateral 3
Square 4
Isosceles 1
Rectangle 2
Square 4
Equilateral triangle 3
Isosceles trapezoid 1
Countless circles
You did the right thing
The bottom of a trapezoid is 18 cm. If the bottom is shortened by 8 cm, it will become a parallelogram, and the area will be reduced by 28 square cm. What is the height of the original trapezoid
() cm
The upper sole is 18-8 = 10cm
If the height is h, then (18 + 10) XH / 2-10h = 28
The solution is: H = 7
The answer is 7cm high
The lower base of a trapezoid is 18 cm. If the lower base is shortened by 8 cm, it will become a parallelogram with an area reduced by 28 square cm. The height of the original trapezoid is______ Cm
According to the meaning of the title, the drawing is as follows: the bottom of the triangle is shortened by 8 cm, and the area of the triangle is reduced by 28 square cm according to the area. We can get: H = s 3 × 2 △ a = 28 × 2 △ 8 = 7 (CM); the height of the triangle is the height of the original trapezoid, so the height of the original trapezoid is 7 cm
RELATED INFORMATIONS
- 1. The area of a trapezoid is 60 square centimeters, the bottom is 10 centimeters, and the height is 8 centimeters. How many centimeters is the top of the trapezoid
- 2. It is known that the bottom of a pyramid p-abcd is a square. How many right triangles are there at most among the four sides? How many pairs of planes are perpendicular to each other
- 3. As shown in the figure, the quadrilateral ABCD is a trapezoid, CD ∥ AB, CD = Ao = 1, △ AOD is an isosceles right triangle, O is the midpoint of AB, try to find the area of the visual graph of the trapezoid ABCD placed horizontally
- 4. The actual distance between Beijing and Nanjing is about 900 kilometers. On the map of China with a scale of 1:4500000, how many centimeters is the distance between the two places
- 5. In the eastern and western hemispheres with a scale of "1 cm in the map represents 1000 km in the field", the length of the equator should be
- 6. Beijing and Tianjin are about 120 kilometers apart. How many centimeters is the distance on the 1:600000 map? The distance between a and B is 15 cm. How many kilometers is the actual distance between a and B?
- 7. China has a total area of 9.6 million square kilometers. On the world map with a scale of 1:200000000, what is the area of China on the map? It's a process
- 8. On the drawing of 1:20000 scale, the width of a playground is 2 cm and the length is 3 cm. How many square meters is the actual area of the playground?
- 9. On the map with the scale of 1 / 2500000, the distance between the two cities is 10cm. If we discuss the distance between the two cities on a map, it is 3.125 Cm, what's the scale of that picture?
- 10. The actual distance between a and B is 150km. If it is 2.5cm drawn on a map, what is the scale of this map? A rectangular plot is 40 m long and 20 m wide. If the plot is drawn on a 40 cm long and 20 cm wide design drawing, what is the appropriate scale?
- 11. The area of a trapezoid is 16 square centimeters, and the sum of the top and bottom is 8 centimeters. How many centimeters is the height?
- 12. There is a right angled trapezoid. The upper bottom is 3 / 5 of the lower bottom, and the lower bottom is reduced by 8 cm. It just turns into a square. What is the area of the original trapezoid?
- 13. Two parallelograms A and B are overlapped. The area of the overlapped part is one fourth of a and one sixth of B. the area of a is 12 square centimeters
- 14. A. Two quadrilaterals of B are overlapped. The overlapped part is one fourth of a and one sixth of B. what is the simplest integer ratio of the area of quadrilateral B and a?
- 15. The area of the overlapping part of two rectangles is equivalent to one sixth of the area of the large rectangle and one fourth of the area of the small rectangle. What is the ratio of the large and small rectangles
- 16. As shown in the figure below, the area of the overlapping part of two rectangles is equal to 1 / 6 of the area of the large rectangle and 1 / 4 of the area of the small rectangle. Find two rectangles As shown in the figure below, the area of the overlapping part of two rectangles is equivalent to 1 / 6 of the area of the large rectangle and 1 / 4 of the area of the small rectangle, and the ratio of the area of the two rectangles is calculated. eleven thousand one hundred and eleven trillion and one hundred and eleven billion one hundred and eleven million one hundred and eleven thousand one hundred and eleven 1 ---------1 1111111111111111111111 1 1 1 1 1 111111111111111 1 11111111111111111111111111111
- 17. The overlapping part of two rectangles is equal to 1 / 6 of the area of large rectangle and 1 / 4 of the area of small rectangle
- 18. The formula for calculating the area of a square is expressed in letters______ ．
- 19. What formula does square area have besides the square of side length
- 20. As shown in the figure below, a rectangle runs from the left side of the square to the right side, running 2 cm per second. The right figure shows the rectangle running After running for 4 seconds, the overlapping area is square centimeter. ② the side length of the square is centimeter. ③ complete the diagram of the overlapping area between the square and the square. ④ the maximum overlapping area is square centimeter. ⑤ it takes seconds for the rectangle to leave the square Please elder brother and elder sister!