the area frans is painting is the surface area of a rectangular prism minus the bottom area. so the A he needs to paint is:
A = wd + 2wh + 2dh
where w is the width
h is height
d is the depth
a = (1 1/3)( 3 ) + 2( 6 )( 1 1/3) + 2( 3 )( 6 )
a = 56 sq ft is the area she intends to paint
