Grade 6 · Math
Find a prism’s total surface area practice
Find the combined area of all six rectangular faces.
Opening your practice adventure…
Try a sample
A closed rectangular prism has length 3 cm, width 7 cm and height 8 cm. What is its total surface area in square centimeters?
- 204
- 203
- 202
- 201
See the answer & why
202
There are three equal pairs of faces: 2(21 + 24 + 56) = 202 square centimeters.
A little hint: Find the area of each face, including both faces in every pair.
A teaching tip
Draw or list the three different faces, double each area, and add.