Trapezoid - Wikipedia

In geometry, a trapezoid (/ˈtræpəzɔɪd/) in North American English, or trapezium (/trəˈpiːziəm/) in British English,[1][2] is a quadrilateral that has at least one pair of parallel sides. The parallel sides are called the bases of the trapezoid. The other two sides are called the legs (or the lateral sides) if they are not parallel; otherwise, the trapezoid is a parallelogram, and there are two pai

[altar]

台形って英語だと何だっけって思ったけどトラペゾ～か／zoidとziumは台形と不等辺四角形、英米で逆の意味になる／上底下底はparallel sidesの(short|long)な方という認識のようで日本語もそのくらいでいい気はする。