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The bottom of the trapezoid is 17.5cm, the height is 5cm, and the two base angles are 45 degrees. To find the area of the trapezoid (I can do it), I just don't know why I want - 5-5
The two base angles are 45 degrees, indicating that it is isosceles trapezoid
Passing through the two ends of the upper bottom, make the vertical line of the lower bottom, and divide the lower bottom into three sections. The middle section is equal to the upper bottom, and the other two sections are equal to the height
The top and bottom of trapezoid is: 17.5-2 × 5 = 7.5cm
The area of trapezoid is: (7.5 + 17.5) × 5 △ 2 = 62.5 square centimeter
In the figure, the bottom of the trapezoid is 17.5cm, the height is 5cm, and the two bottom angles are 45 degrees
17.5-5 × 2 = 7.5 (CM), (7.5 + 17.5) × 5 △ 2, = 25 × 5 △ 2, = 62.5 (square cm); answer: the area of trapezoid is 62.5 square cm
The height of the right angled trapezoid is 10 cm, the angle between one waist and the lower bottom is 45 ° and the length of the lower bottom is twice that of the upper bottom, then the area of the right angled trapezoid is 10 cm______ ．
Let d be de ⊥ BC in E, ∵ B = 90 °, ∵ ab ⊥ BC, ∵ ab ∥ De, ∵ ad ∥ BC, ∵ quadrilateral abed is rectangular, ∵ de = AB = 10, ad = be, ∵ BC = be + CE = 2ad,
RELATED INFORMATIONS
- 1. A right angled trapezoid with a base angle of 60 ° has a top bottom length of 10 cm and a waist length perpendicular to the bottom of 10 cm. Make a triangle on one side of the upper bottom or waist perpendicular to the bottom so that the other side of the triangle is 15 cm long and the third vertex falls on the bottom. Please calculate the area of the triangle
- 2. It is known that the waist length of a right angled trapezoid is 10cm. What is the length of the other waist when the waist and a low one are called 30 degrees?
- 3. The base of an isosceles right triangle is 24cm long, and its area is______ cm2．
- 4. It is known that the area of a right triangle is 12cm2 and the perimeter is 122cm, then the radius of the circumscribed circle of the right triangle is___ cm．
- 5. One bottom of a right angled trapezoid is 10 cm. If the other bottom is reduced by 2 cm, the trapezoid becomes a square. What is the area of the right angled trapezoid（
- 6. A right angle trapezoid is 8cm high. If you shorten its bottom to a little, you will get an isosceles right triangle. The area of the original trapezoid is one fourth of that of the original trapezoid. The area of the original trapezoid is () square centimeter
- 7. 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
- 8. 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
- 9. 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
- 10. 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
- 11. There is a trapezoid with a base angle of 45 degrees, an upper base of 8 cm and a lower base of 12 cm. What is the area of this trapezoid?
- 12. In a right angle trapezoid ABCD, if angle a = angle B = 90 °, angle c = 45 °, ab = 6 and ad = 2, what is the area of the bottom edge BC =? Trapezoid ABCD
- 13. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
- 14. As shown in the figure, the area of a regular hexagon is 24 square centimeters. Find the area of the shadow part
- 15. A trapezoid has an upper sole of 8 cm and a lower sole of 10 cm, with an area of 54 square cm. When the upper sole increases by 3 cm, the area increases by () square cm
- 16. There is a trapezoid whose bottom is three times as high as the top, and its height is 10 cm. If you add 6 cm to the top and subtract 4 cm from the bottom, it will become a rectangle. How about the area of the trapezoid? There should be a formula
- 17. (1) which triangles are congruent in the graph? (2) Choose a pair of congruent triangles to prove
- 18. As shown in the figure, in the parallelogram ABCD, ad ⊥ BD, ad = 4, do = 3 (1) find the perimeter of △ cod (2) find the parallelogram a
- 19. As shown in the figure, in the quadrilateral ABCD, the point E is on BC, ∠ a + ∠ ade = 180 °, ∠ B = 78 ° and ∠ C = 60 ° to find the degree of ∠ EDC
- 20. As shown in the figure, in ladder ABCD, ad ‖ BC, ab = DC, ∠ ABC = 72 °, now move waist AB to de in parallel, and then fold △ DCE along De to get △ DC ′ e, then the degree of ∠ EDC ′ is______ Degree