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.

   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
2. 2.

   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
3. 3.

   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
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.

   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
8. 8.

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

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

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

   • Surface area, in square inches
   • Perimeter of one face, in inches
   • Volume, in cubic inches
10. 10.

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

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