a + c = 180;
b + d = 180;
b = 2*a;
d = 3*a;
5*a = 180;
a = 36; b = 72; c = 144; d = 108; (градусов, конечно :))
a + c = 180;
b + d = 180;
b = 2*a;
d = 3*a;
5*a = 180;
a = 36; b = 72; c = 144; d = 108; (градусов, конечно :))