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As shown in the figure, in rectangular ABCD, ∠ AED = ∠ BEC = 30 ° ad = 1m, try to estimate the length of de + EC + AE. (the error is less than 1m) For the specific process, the figure is about ABCD is a rectangle, divided into three triangles, AB is the bottom edge, e is the middle point of ab
Estimation? Error?
I can only calculate accurately
It is known that, as shown in the figure, in the trapezoidal ABCD, ad is parallel to BC, AD + BC = ab. e is the midpoint of CD
Take the midpoint F of AB and connect EF. Then EF is the median line of trapezoid. So EF = 1 / 2 (AD + BC), because AD + BC = AB, EF = 1 / 2Ab, that is, EF = AF = BF, so AE is vertical to be
It is known that the circumference of the white rectangle below is 42 cm, and the shadow is a square. What is the length and width of the large rectangle? Remove the shadow and the width is 5%
32 △ 2 + 20 = 36 square centimeter. Large square area
36 = 6 * 6. Side length is 6
6 * 4 = 24cm. Side length of large square
24 * 2 = 48 cm
The perimeter of a large rectangle is 30cm, and the shadow is square. The small rectangle beside the shadow square is 3cm wide
Find the length and width of a large rectangle
Let the length of a square be X
4 x +3+3=30
x=6
The rectangle is 9 in length and 3 in width
RELATED INFORMATIONS
- 1. It is known that the perimeter of a large rectangle is 30 cm, and the shadow part is a rectangle. How about the length and width of a large square?
- 2. A square is divided into five equal rectangles, each with a circumference of 60 cm and a square with a circumference of () cm A. 300B. 200C. 100
- 3. As shown in the figure, a square is divided into three identical rectangles. If the perimeter of one of the rectangles is 16 cm, then the perimeter of the square is 16 cm______ Cm
- 4. The circumference of a rectangle is 26 cm, its length is 8 cm, and its area is 8 cm
- 5. The circumference of a rectangle is equal to that of a circle. The length of a rectangle is 4.85cm, which is 1.85cm longer than the width. What is the area of the circle in square centimeter?
- 6. The circumference of a rectangle is 40 cm, the length is 12 cm, and the width is how many cm?
- 7. The circumference of a rectangle is cm, if the length of the rectangle is am (AM)
- 8. The perimeter of a rectangle is 64cm, the width is 3 / 5 of the length. What is the area of the rectangle in square centimeter
- 9. The circumference of a rectangle is 10 cm, and the ratio of length to width is 3:2. How many square centimeters is its area?
- 10. The circumference of a rectangle is 12. Let its length be y and width be X. try to find the functional relationship between Y and X and write out the value range of the independent variable
- 11. In known trapezoidal ABCD, ad is parallel to BC (AD is less than BC), m and N are two waist AB, the midpoint of CD, me is parallel to an, BC intersects e, am = ne is proved
- 12. In known ladder ABCD, AD / / BC (AD
- 13. The diagonal lines AC and BD of parallelogram ABCD intersect at point O, and intersect with AB and CD respectively, and then verify with points E and f; OE = of
- 14. In the isosceles trapezoid ABCD, ad ∥ BC, AB is equal to DC, AC and BD intersect at the point O, ∠ BOC is equal to 90 ° and BD = 10?
- 15. The base angle of a right angle trapezoid is 45 degrees, the top is 3cm, and the area is 20cm
- 16. It is known that the bottom of a right angled trapezoid is 30 cm and its height is 12 cm. Divide it into a rectangle and a triangle. The area of the triangle is 72 square cm. What is the area of the trapezoid?
- 17. The trapezoid in the figure below is composed of a square and an isosceles right triangle. It is known that the side length of the square is 12 cm, so the area of the trapezoid can be calculated
- 18. There is a square with a circumference of 32 cm. Cut and fill the square into a trapezoid. What is the area of the trapezoid after cutting and filling
- 19. In a set of opposite sides of a square, one side is increased by 16 cm, and the other side is decreased by 11 cm. In this way, it becomes a trapezoid. What is the area of the trapezoid
- 20. A trapezoid, if the upper bottom increases by 2 cm and the lower bottom decreases by 2 cm, becomes a square with a side length of 5 cm. The area of this trapezoid is______ Square centimeter