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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
Trapezoid's upper bottom: 5-2 = 3cm, trapezoid's lower bottom: 5 + 2 = 7cm, trapezoid's area: (3 + 7) × 5 / 2, = 10 × 5 / 2, = 25 (square centimeter); answer: This trapezoid's area is 25square centimeter. So the answer is: 25
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
Trapezoid's upper bottom: 5-2 = 3cm, trapezoid's lower bottom: 5 + 2 = 7cm, trapezoid's area: (3 + 7) × 5 / 2, = 10 × 5 / 2, = 25 (square centimeter); answer: This trapezoid's area is 25square centimeter. So the answer is: 25
A trapezoid, after its bottom is shortened by 5 cm, becomes a square, and the area is reduced by 20 square cm. What is the area of the original trapezoid?
20 × 2 / 5 = 8 (CM), (8 + 5 + 8) × 8 / 2, = 21 × 8 / 2, = 84 (square cm); answer: the original trapezoid area is 84 square cm
RELATED INFORMATIONS
- 1. 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
- 2. 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
- 3. 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
- 4. 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?
- 5. The base angle of a right angle trapezoid is 45 degrees, the top is 3cm, and the area is 20cm
- 6. 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?
- 7. 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
- 8. In known ladder ABCD, AD / / BC (AD
- 9. 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
- 10. 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
- 11. 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
- 12. 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（
- 13. 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．
- 14. The base of an isosceles right triangle is 24cm long, and its area is______ cm2．
- 15. 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?
- 16. 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
- 17. 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
- 18. 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?
- 19. 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
- 20. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)