The perimeter of an equilateral trapezoid is 39 cm, the lower base is twice as long as the upper base, and the waist is 2 cm longer than the upper base

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• 1. An isosceles trapezoid, the sum of the top and bottom is 14.5 cm, waist length is 6.8 cm, how many cm is his circumference?
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• 9. It is known that the area of triangle AOB is 15 square centimeters, and the length of line ob is 3 times of OD. The area of trapezoid ABCD is calculated
• 10. As shown in the figure, in the trapezoidal ABCD, AB is parallel to DC, AC and BD intersect at O. if the area of triangle ODC is 1:4 than that of triangle AOB, calculate the area of triangle ODC Ratio of area to area of triangle AOD
• 11. The circumference of an isosceles trapezoid is 39 cm, the upper base is 2 cm shorter than the waist, and the lower base is twice as long as the upper base
• 12. A triangle and a parallelogram have the same area and height. If the bottom of the triangle is 18 cm, the bottom of the parallelogram is () cm A. 9B. 18C. 36
• 13. The bottom of a trapezoid is 20 cm. If the upper bottom is extended by 8 cm, it becomes a parallelogram, and the area increases by 24 square cm. The original trapezoid area is ()
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