The surface area of a prism = 2 × area of base  +  perimeter of base × H

Rectangular based prism

Base shape: Rectangle, length 'L' and width 'W'

Area of base: L  × W

Perimeter of base: 2(L+W)

Surface area = 2LW + 2(L+W)H

Circular based prism

Base shape: Circle, radius 'R'

Area of base: pR²

Perimeter of base: 2pR

Surface area = 2pR² + 2pRH

riangular based prism

Base shape: Triangle: base 'b', height 'h', and sides S1, S2 and S3 

Area of base: ½b×h

Perimeter of base: S1+ S2 + S3

Surface area = bh + (S1+ S2 + S3)H