Surface area from a net: prisms and pyramids

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Jun's gift box is 8 cm long, 5 cm wide and 2.5 cm tall. Nobody may shake it. What is its surface area in square cm?

   145
2. 2.

   Kira's lunch box is 7.5 in long, 3 in wide and 5 in tall. It rattles a little. What is its surface area in square inches?

   150
3. 3.

   Milo's cheese wedge is a prism 5 cm long. Its end is a right triangle: legs 9 and 12, long side 15 cm. Lots of holes. What is its surface area in square cm?

   288
4. 4.

   Ren's paper tent is a prism 8 in long. Its end is a triangle: base 9, height 6, two slanted sides of 7.5 in. Tape holds it. What is its surface area in square inches?

   246
5. 5.

   Ari's storage box is a prism 5 in long. Its end is a trapezoid: parallel sides 11.5 and 8.5, height 4, slanted side 5 in. Socks inside. What is its surface area in square inches?

   225
6. 6.

   Bo's castle roof has a base of 15 cm by 6 cm and a height of 4 cm. A flag waves. What is its surface area in square cm?

   216
7. 7.

   Milo's lunch box is 6 in long, 2.5 in wide and 4 in tall. Milo makes the height twice as tall. More room for snacks. What is its new surface area in square inches?

   166
8. 8.

   Noah wants to wrap a gift box in paper. The ribbon is extra curly. Which measure tells how much paper covers it?

   • Volume, in cubic cm
   • Surface area, in square cm
   • Length of one edge, in cm
9. 9.

   Pia wants to know how much room is inside a toy chest. It is a bit messy. Which measure is that?

   • Length of the floor's edge, in inches
   • Surface area, in square inches
   • Volume, in cubic inches
10. 10.

    Ren paints the outside of a wooden block. It has a golden star. Which measure tells how much surface the paint covers?

    • Volume, in cubic inches
    • Surface area, in square inches
    • Perimeter of one face, in inches