Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degree?
1)tew of the interior angles of ABCD are right angles
2)the degree measure of angle ABC is twice the degree measure of angle BCD
答案是C,可直角梯形,从左上角逆时针标注,就不成立啊?难道顺时针标注是ETS默认? |