RÄspuns
9²āæāŗĀ¹ n=0,1,2,3,..., 2) x,y,z.t unghiurile ;x+y+z+t=360ā° x\5=y\7=z\8=t\10=k ;x=5k;y=7k;z=8k;t=10k; 5k+7k+8k+10k=360ā° ;30k=360ā° ; k=12; x=12.5=60ā° ;y=12.7=84ā° ;z=12.8=96ā° ;t=12.19=120ā°
ExplicaČie pas cu pas:
3)ĪCFB dreptunghic isoscel; DE=AE =(20-6):2=14:2=7 ;A (B+b).h\2=26.7:2=13.7=91cm²