Ireally dont get this and explain! : )

So for perimeter you need to find out the total of all the sides. To find out side AB, you make a triangle and find out the hypotenuse.

a=5 and b=6
a square= 25 b square= 36
25+36= 61
Square root of 61 is 7.81

So side AB is 7.81 ft

Now we need to find out side BC.

a=3 and b=4
a square is 9 and b square is 16.
9+16 is 25
Square root of 25 is 5

Side BC is 5 ft.

Because it's a rectangle, side CD will be 7.81 and side DA will be 5.

7.81*2+5*2= 25.62 ft

So the perimeter of the rectangle is 25.62 ft or C.