CPM Homework Help : MC2 Problem 9-94

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9-94.

Find the missing dimension of each rectangle or square.

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

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

Hint (a):
If area is length times width, then:
$8(x)=100$
Answer (a):
$12.5$ ft

Hint (b):
You can do this one similarly to part (a).
More Help (b):
$12(x)=144$
Answer (b):
$12(12)=144$

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

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

Hint (c):
See part (a).

Hint (d):
See part (a).
Answer (d):
$7$ in.

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

Hint (e):
See part (a).
Answer (e):
$22.5$ km

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