9. •The total surface area of a rectangular prism
= Area of 6 rectangles
=lb+bh+lh+bh+lh
=2lb+2lh+2bh
=2(lb+bh+lh)
10. Total surface area of a Rectangular prism
Total surface area of a Rectangular prism
=2(lb+bh=lh)
i– length of the rectangular prism
b-breadth of the rectangular prism
h – height of rectangular prism