Which figure is a cube? How do you know?
Figure C; all of its faces
and edges are equal.
How would you use a ruler to measure the cube's edge?
Line the ruler up along the edge. Put 0 at one end of the edge and read the number of inches at the other end. If the edge is longer than the ruler, use multiple rulers and place them end-to-end with no gaps or overlaps, then add 12 inches for each ruler.
If one edge is 14 inches long, how long are the other edges? Why?
14 inches; all edges of a cube are equal.
How would you use unit squares to measure the cube's face?
Tile the face with rows and columns of unit squares with no gaps or overlaps. Then, count how many tiles there are. The number of tiles is the area.
If one face fits exactly 196 unit squares, what is its area?
196 square units.
If the area of one face is 196 square units, what is the area of the other faces? Why?
196 square units; all the faces of a cube have an equal area.
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