3. Some shapes are drawn on a piece of paper. The teacher folds the left-hand side of the paper over the central bold line. How many of the shapes on the left-hand side will fit exactly on top of a shape on the right-hand side?
A 1
B 2
C 3
D 4
E 5
Solution
C

A shape on the left-hand side will fit exactly over a shape on the right-hand side if it is a mirror image and the same distance away from the fold line. Therefore, the top three shapes will fit exactly, but the circles are not the same distance from the fold line and the lower triangles are not mirror images of each other.