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一、填空题(每题5分,共40分)1.一个梯形中,相等的内角最多有_个.2.若梯形上底和中位线的长分别是10cm和14cm,则下底的长是_cm.3.若等腰梯形的周长是38cm,腰长是8cm,则中位线长是_cm.4.若直角梯形被一条对角线分成两个等腰直角三角形,且最小边长是1cm,则最大边长是___cm.5.梯形ABCD中,AD∥BC,若∠B=50°,∠C=80°,AD=10cm,BC=18cm,则 CD=____cm
First, fill in the blanks (5 points for each question, a total of 40 points) 1. A trapezoid, equal to the maximum internal angle _. 2. If the trapezoidal bottom and the median line length is 10cm and 14cm, then the bottom of the The length is _cm.3. If the circumference of the isosceles trapezoid is 38cm and the length of the waist is 8cm, the median line length is _cm.4. If the right angle trapezoid is divided into two isosceles right-angle triangles by a diagonal line, and The minimum side length is 1cm, then the maximum side length is ___cm.5. In trapezoid ABCD, AD∥BC, if ∠B=50°, ∠C=80°, AD=10cm, BC=18cm, then CD=____cm