2. A square has the same perimeter as an equilateral triangle whose sides all have length $12 \mathrm{~cm}$.
What is the length, in $\mathrm{cm}$, of the sides of the square?
A 9
B 12
C 16
D 24
E 36
Solution
$\mathbf{A}$

The triangle has perimeter $3 \times 12=36 \mathrm{~cm}$. The length, in $\mathrm{cm}$, of the sides of the square is $36 \div 4=9 \mathrm{~cm}$.