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.

   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
3. 3.

   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
4. 4.

   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
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.

   Jun's playhouse roof has a base of 8 cm by 4.5 cm and a height of 3 cm. A chimney peeks out. What is its surface area in square cm?

   88.5
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?

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

    Tala wants to know how much a lunch box can hold. Snacks are on the way. Which measure is that?

    • Surface area, in square cm
    • Volume, in cubic cm
    • Length of the longest edge, in cm