### Home > MC2 > Chapter 9 > Lesson 9.3.2 > Problem9-94

9-94.

Find the missing dimension of each rectangle or square.

1. $8\ \text{ft} \ \boxed{\text{ A}=100 \ \text{ft}^2 \quad}$

1. $\ \quad 12\ \text{mm} \\\ \boxed{\text{ A}=\\144 \ \text{mm}^2 }$

• If area is length times width, then:
$8(x)=100$

$12.5$ ft

• You can do this one similarly to part (a).

$12(x)=144$

$12(12)=144$

1. $\ 10\ \text{cm} \\\ \boxed{\text{A}=\\144 \\\ \text{cm}^2}$

1. $\quad 7\ \text{in.} \\ \ \boxed{\text{A}=\\49 \ \text{in.}^2}$

• See part (a).

• See part (a).

$7$ in.

1. $6.4\ \text{km} \ \boxed{\text{A}=144 \ \text{km}^2}$

• See part (a).

$22.5$ km
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