An isosceles trapezoid, the bottom is 45 degrees, the upper bottom is 8 cm long, and the lower bottom is 12 cm long. What is the area of this trapezoid

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• 1. An isosceles trapezoid, the base angle is 45 degrees, the upper bottom is 8 cm long, and the lower bottom is 12 cm long. What is the area of this trapezoid?
• 2. What's the area of the right angled trapezoid below? It's four centimeters at the top, six centimeters at the bottom, and 45 degrees at the left
• 3. In the right angle trapezoid, the longer base is 10cm, the height of this base is 4cm, and a base angle is 45, then the area of this trapezoid is______ cm2．
• 4. If one waist of the right angled trapezoid is 10, the angle between the waist and the lower bottom is 45 ° and the lower bottom is twice the length of the upper bottom, then the area of the right angled trapezoid is () A. 100B. 75C. 10(2+1)D. 10(22+1)
• 5. 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______ ．
• 6. It is known that the waist of a right angle trapezoid is 10cm, the angle between the waist and the bottom is 30 degrees, and the length of the upper bottom is 3cm
• 7. The two lengths of a right angled trapezoid are 8cm and 10cm respectively, and the sum of the top and bottom is 14cm. What is the area of this right angled trapezoid? Urgent ah, please quickly tell the answer, ah, a good answer to the reward
• 8. In trapezoidal ABCD, if ad ‖ BC, ∠ B = 90 °, C = 45 °, CD = 10cm, BC = 2ad, the area of trapezoid is______ cm2．
• 9. As shown in the figure, if ∠ B = 90 °, ad ‖ BC, ab = BC = 8, CD = 10, the area of trapezoid is______ A unit of square
• 10. The bottom of an isosceles trapezoid is twice as big as the top, the base angle is 45 degrees, the height is 3cm, and the area of this trapezoid is () square centimeter Explain why, try to answer so that pupils can understand
• 11. In trapezoidal ABCD, AB is parallel to DC, angle a = 60 degrees, angle B = 45 degrees, DC = 2, ad = 4. What is the area of trapezoidal ABCD
• 12. As shown in the figure, it is known that the height of right angled trapezoid is 30cm, ∠ 1 = ∠ 2 = 45 ° and the area of trapezoid ABCD is calculated
• 13. As shown in the figure, it is known that the height of right angled trapezoid is 30cm, ∠ 1 = ∠ 2 = 45 ° and the area of trapezoid ABCD is calculated
• 14. It is known that the height of ladder ABCD is h. The two diagonals form angles of 30 degrees and 45 degrees respectively with the bottom to calculate the area of ladder
• 15. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
• 16. As shown in the figure on the right, the area of blank part is 24 square centimeters, the area of shadow part a is 5 square centimeters, so the area of shadow part B is () square centimeters?
• 17. The length of a cuboid is 12 cm and the height is 8 cm. The area sum of the four sides of the blank part is 392 square cm. What is the area sum of the shadow part? What is the volume of the cuboid?
• 18. The top bottom of trapezoid is 8 cm, the bottom is 6 cm, the area of shadow part is 12 square cm, and the area of blank part is how many square cm? On August 8, 2008, Beijing has successfully held the 29th Olympic Games. There are about 4125.5 million people watching TV in the world. The unit of "ten thousand people" is () ten thousand people, and the mantissa after "hundred million" is () hundred million people If you sell a pen for 100 yuan, you can earn 25%. If you sell it for 120 yuan, how much can you earn
• 19. A trapezoid has an upper base of 8 cm and a lower base of 14 cm. There is a semicircle in the middle with a diameter of 8 cm. The rest are shadows. Calculate the area of shadows
• 20. Given that the area of trapezoid is 54 square centimeter, calculate the area of shadow part