Homework Help: Geometry

Posted by ? on Saturday, October 25, 2008 at 6:12pm.

The surface of a cube is painted red and blue, 3 sides of each color. the cube is then cut into 27 equal sized smaller cubes.

A: How many cubes have at least 2 sides painted blue?

B: How many cubes have at least 1 side painted red?

Geometry - Fredr, Sunday, October 26, 2008 at 2:02am
A: it depends how the cube is painted. If the 3 blue sides of the original cube share a common corner then 7 of the smaller cubes have at least 2 sides that are blue. If 2 opposite faces of the original cube are blue then 6 of the 27 have at least 2 faces that are blue.

B: 19 or 21, again depending on how the original cube is painted.

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