Chapter 12.4B, Problem 1A

School pictures come in $8\text{}\text{}\text{in}\text{.}\text{by}10\text{in}\text{.}$, $5\text{in}\text{.}\text{by}7\text{in}\text{.}$ and wallet size $2\frac{1}{4}\text{in}\text{.}\text{by}3\frac{1}{4}\text{in}.$ Are the pictures similar to each other? Why?