h_(ромба)=2r h_(ромба)=a*sin60 ° =16*(sqrt(3)/2)=8sqrt(3) r=O_(1)A=O_(1)B=4sqrt(3) OO^2_(1)=OA^2-O_(1)A^2=8^2-(4sqrt(3))^2=64-48=16 OO_(1)=[b]4[/b]