Am,desenat,trapezul,cu,baza,mare,CD,pe,orizontala.
Am,coborat,perpendicularele,din,A,si,B,pe,CD,si,am,notat,picioarele,acestora,cu,M,si,N.
Trapezul,fiind,isoscel,si,ABllCD=>AB=MN=2cm=>Segmentele,DM=NC=2cm
In,Δdr.AMD,calculam,cateta,AM,care,este,si,inaltime.
AD²=AM²+DM²
25=AM²+4
AM²=21=>AM=√21
=>Aria=(B+b)xh/2=(6+2)√21/2=4√21cm²
In,Δdr.AMC,calculam,diag.
AC²=MN²+AM²
AC²=16+21
AC²=37=>AC=√37
