Textbook Problem

In Exercise 11 and 12, provide the missing statements and reasons.

	Given:	$\angle \text{s}$ $1$ and $3$ are complementary $\angle \text{s}$ $2$ and $3$ are complementary
	Prove:	$\angle 1\cong \angle 2$
PROOF
Statements			Reasons
1. $\angle \text{s}$ $1$ and $3$ are complementary $\angle \text{s}$ $2$ and $3$ are complementary			1. ?
2. $\begin{array}{l}m\angle 1+m\angle 3=90;\\ m\angle 2+m\angle 3=90\end{array}$			2. The sum of the measures of complementary $\angle \text{s}$ is $90$
3. $m\angle 1+m\angle 3=m\angle 2+m\angle 3$			3. ?
4. ?			4. Subtraction Property of Equality
5. ?			5. If two $\angle \text{s}$ are $=$ in measure, they are $\cong$