Răspunsuri

2014-11-02T19:45:17+02:00
MC+MD=CD => 4*MD=16 => MD=4=AB, M∈CD, deci MD||AB. MD si AB sunt paralele si congruente => ABMD paralelogram
2014-11-02T19:45:55+02:00
DM+MC=DC
MD+3MD=DC
4MD=16=>MD=4
1-MD=4 
2-AB=4
3-MD||AB
1-2-3=>ABMD paralelogram