Sorry guys ... I feel really stupid posting this ... but am I going mad!?!? I'm preparing some revision materials for a session tomorrow, and have come across this question: Angles in a quadrilateral are in the ratio 1:2:4:5.If the largest angle is 72º<font face="Calibri">, find the </font>value of the other three angles. It then has a "wrong" solution which the pupil has to comment on, and then provide a correct solution themselves. The "wrong" solution basically goes through 1+2+4+5 = 12. 360/12 = 30 so the other angles are 1x30=30, 2x30=60 and 4x30=120. It seems to me that the question MUST BE WRONG!! How can the largest angle in a quadrilateral be 72? If the original question made no mention of 72 then the "wrong" solution would surely be totally correct!! Please confirm that I haven't gone mad and I didn't leave my brain in the classroom when we broke up on Friday.