gwd 13

lololo

Q13:

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

(1) Two 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,我觉得是E,大家看看对不对？

teyvhf

条件1知道剩下的2个角度和为180.条件2可以知道一个角是60度.假设剩余的2个角一个为x.则x+2x=180---x=60.我选C