Solve the Problem $45 \sqrt { 2 } \mathrm {~cm}$ B) $45 \mathrm {~cm}$

Multiple Choice

Solve the problem.
-A square sheet of paper measures 45 centimeters on each side. What is the length of the diagonal of this paper?

A) $45 \sqrt { 2 } \mathrm {~cm}$
B) $45 \mathrm {~cm}$
C) $4050 \mathrm {~cm}$
D) $90 \mathrm {~cm}$