Four side faces in a row are one rectangle as wide as the base's perimeter · 12 practice problems

Folding it back up gives a prism 10 by 6 by 3 cm, whose four side faces are 10x3 and 6x3 twice over -- and those add to 96 cm2.

Another way: Adding the four faces separately gives $2 \times 10 \times \text{AB} + 2 \times 6 \times \text{AB} = 96$, the same equation with the factoring left undone.

Folding it back up gives a prism 8 by 5 by 4 cm, whose four side faces are 8x4 and 5x4 twice over -- and those add to 104 cm2.

Another way: Adding the four faces separately gives $2 \times 8 \times \text{AB} + 2 \times 5 \times \text{AB} = 104$, the same equation with the factoring left undone.

Folding it back up gives a prism 5 by 2 by 9 cm, whose four side faces are 5x9 and 2x9 twice over -- and those add to 126 cm2.

Another way: Adding the four faces separately gives $2 \times 5 \times \text{AB} + 2 \times 2 \times \text{AB} = 126$, the same equation with the factoring left undone.

Folding it back up gives a prism 7 by 4 by 6 cm, whose four side faces are 7x6 and 4x6 twice over -- and those add to 132 cm2.

Another way: Adding the four faces separately gives $2 \times 7 \times \text{AB} + 2 \times 4 \times \text{AB} = 132$, the same equation with the factoring left undone.

Folding it back up gives a prism 6 by 3 by 8 cm, whose four side faces are 6x8 and 3x8 twice over -- and those add to 144 cm2.

Another way: Adding the four faces separately gives $2 \times 6 \times \text{AB} + 2 \times 3 \times \text{AB} = 144$, the same equation with the factoring left undone.

Folding it back up gives a prism 9 by 6 by 5 cm, whose four side faces are 9x5 and 6x5 twice over -- and those add to 150 cm2.

Another way: Adding the four faces separately gives $2 \times 9 \times \text{AB} + 2 \times 6 \times \text{AB} = 150$, the same equation with the factoring left undone.

Folding it back up gives a prism 11 by 8 by 4 cm, whose four side faces are 11x4 and 8x4 twice over -- and those add to 152 cm2.

Another way: Adding the four faces separately gives $2 \times 11 \times \text{AB} + 2 \times 8 \times \text{AB} = 152$, the same equation with the factoring left undone.

Folding it back up gives a prism 15 by 11 by 3 cm, whose four side faces are 15x3 and 11x3 twice over -- and those add to 156 cm2.

Another way: Adding the four faces separately gives $2 \times 15 \times \text{AB} + 2 \times 11 \times \text{AB} = 156$, the same equation with the factoring left undone.

Folding it back up gives a prism 12 by 7 by 5 cm, whose four side faces are 12x5 and 7x5 twice over -- and those add to 190 cm2.

Another way: Adding the four faces separately gives $2 \times 12 \times \text{AB} + 2 \times 7 \times \text{AB} = 190$, the same equation with the factoring left undone.

Folding it back up gives a prism 14 by 9 by 6 cm, whose four side faces are 14x6 and 9x6 twice over -- and those add to 276 cm2.

Another way: Adding the four faces separately gives $2 \times 14 \times \text{AB} + 2 \times 9 \times \text{AB} = 276$, the same equation with the factoring left undone.

Folding it back up gives a prism 9 by 4 by 11 cm, whose four side faces are 9x11 and 4x11 twice over -- and those add to 286 cm2.

Another way: Adding the four faces separately gives $2 \times 9 \times \text{AB} + 2 \times 4 \times \text{AB} = 286$, the same equation with the factoring left undone.

Folding it back up gives a prism 13 by 10 by 7 cm, whose four side faces are 13x7 and 10x7 twice over -- and those add to 322 cm2.

Another way: Adding the four faces separately gives $2 \times 13 \times \text{AB} + 2 \times 10 \times \text{AB} = 322$, the same equation with the factoring left undone.