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.

   Noah's cheese block is a prism 7 cm long. Its end is a right triangle: legs 8 and 15, long side 17 cm. Lots of holes. What is its surface area in square cm?

   400
4. 4.

   Pia's camping tent is a prism 7 ft long. Its end is a triangle: base 6, height 4, two slanted sides of 5 ft. Campfire nearby. What is its surface area in square feet?

   136
5. 5.

   Tala's recycling bin is a prism 10 in long. Its end is a trapezoid: parallel sides 15 and 10, height 12, slanted side 13 in. Always ready. What is its surface area in square inches?

   800
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.

   Kira's storage box is 4 in long, 3 in wide and 2 in tall. Kira makes the height twice as tall. It is extra roomy now. What is its new surface area in square inches?

   80
8. 8.

   Luz's gift box is 5 in long, 4 in wide and 3 in tall. Luz makes the height twice as tall. Bigger boxes mean bigger bows. What is its new surface area in square inches?

   148
9. 9.

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

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

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