(1)、△OPQ的面积S=0.5*OP*OQ=0.5*(根号2)t*(8-t)=根号2*(8t-t^2)/2
(2)、四边形OPBQ的面积=矩形OABC的面积-△QCB的面积-△PAB的面积
=8*8根号2-0.5*8根号2*t-0.5*8*(8根号2-t根号2)
=64根号2-32根号2
=32根号2
(1)、△OPQ的面积S=0.5*OP*OQ=0.5*(根号2)t*(8-t)=根号2*(8t-t^2)/2
(2)、四边形OPBQ的面积=矩形OABC的面积-△QCB的面积-△PAB的面积
=8*8根号2-0.5*8根号2*t-0.5*8*(8根号2-t根号2)
=64根号2-32根号2
=32根号2