The area of a right trapezoid is () A. 30 square centimeter B. 60 square centimeter C. 24 square centimeter D. 120 square centimeter

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• 1. As shown in the figure, in an isosceles right triangle, after cutting off a triangle, there is an isosceles trapezoid with the upper bottom 5 cm long and the lower bottom 9 cm long. What is the area of this trapezoid______ Square centimeter
• 2. Two isosceles right triangles ABC and fed are partially overlapped, and their right sides are 15cm and 9cm respectively. The area of trapezoid gbed is calculated
• 3. A right angled trapezoid is 8 cm 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
• 4. 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
• 5. There is a trapezoid. Its upper bottom is 5cm and its lower bottom is 7cm. If the upper bottom is only increased by 3cm, its area will be increased by 4.5cm. How about the area of the original trapezoid?
• 6. For a right angle trapezoid, the ratio of the upper bottom to the lower bottom is 3:5. If you increase the upper bottom by 7 cm and the lower bottom by 14 cm, you can turn it into a square and find the area of the trapezoid
• 7. As shown in the figure, the perimeter of the square is 28cm. Find the area of the trapezoid. (unit: cm)
• 8. The perimeter of a square is 36 cm. Cut and fill the square into a trapezoid. How many square meters is the area of the trapezoid?
• 9. The trapezoid's upper bottom is increased by 3 cm, and the lower bottom is increased by 2.5 cm to form a square with a circumference of 36 cm
• 10. A trapezoid, after the lower sole is shortened by 11.1 cm, just becomes a square. The perimeter of the square is 35.6 cm, and the original trapezoid area is ()
• 11. The circumference of a circle is 25.121cm, the triangle in the circle is an isosceles right triangle, and the bottom of the triangle is the diameter of the circle to calculate the area of the triangle
• 12. The base of an isosceles right triangle is 24cm long, and its area is______ cm2．
• 13. The bottom of an isosceles trapezoid is twice as big as the top, the base angle is 45, the height is 3 cm, and the area of this trapezoid is 3 cm______ ．
• 14. The bottom of an isosceles trapezoid is twice as big as the top, the base angle is 45, the height is 3 cm, and the area of this trapezoid is 3 cm______ ．
• 15. Trapezoid bottom is 18.5 cm, height is 5 cm, two bottom angles are 45 degrees, the trapezoid area
• 16. 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
• 17. As shown in the figure, if ∠ B = 90 °, ad ‖ BC, ab = BC = 8, CD = 10, the area of trapezoid is______ A unit of square
• 18. In trapezoidal ABCD, if ad ‖ BC, ∠ B = 90 °, C = 45 °, CD = 10cm, BC = 2ad, the area of trapezoid is______ cm2．
• 19. 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
• 20. 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