Solve
-The Diagonal of a Rectangular Storage Room Is 7 $7 \sqrt { 10 }$

Multiple Choice

Solve.
-The diagonal of a rectangular storage room is 7 yards long. If its length is 3 times its width, find the dimensions of the room.

A) $7 \sqrt { 10 }$ yards by $21 \sqrt { 10 }$ yards
B) $\frac { \sqrt { 10 } } { 10 }$ yards by $\frac { 3 \sqrt { 10 } } { 10 }$ yards
C) $\frac { 3 \sqrt { 10 } } { 10 }$ yards by $\frac { 9 \sqrt { 10 } } { 10 }$ yards
D) $\frac { 7 \sqrt { 10 } } { 10 }$ yards by $\frac { 21 \sqrt { 10 } } { 10 }$ yards