Question

cum se poate argumenta ca datele din desen sunt gresite?

Answer 1

a)
$angle CBD=angle CAERightarrow BD parallel AERightarrowangle CDB=angle CEA,; angle CDBneqangle CEA$

b)
$angle ABD+angle BDC+angle DCA+angle CAB=360^circ\130^circ+40^circ+130^circ+50^circ=350^circneq360^circ$