PLEASE HELP IM LITTERALLY GONNA DIE

16cm

Step-by-step explanation:

hey there

First you would use Pythagoras in order to work out the shorter length of the rectangle: a²+b²=c²

                        5²+b²=6²

                         25+b²=36

                          36-25=b²

                          b²=9 and therefore b=3cm

Finally all we have to do is find the perimeter by doing (2×3) +(2×5)

which gives us an answer of 16cm

Hope this helped:)