1/Se rezolva grafic:
l |----------|;
L |----------|----------|----------|----------| }90;;;;;;;
2/1+4=5/parti egale/;
3/90:5=18/latimea ( l ) dreptunghiului/;
4/18x4=72/Lungimea ( L ) dreptunghiului/;
Verificare::::18+72=90; R:18 ( l ),72 ( L )
Coroana+Multumesc?