Question

lication equation to find the area of each rectangle.
2.
40 cm
30 m
9 m
a = l×w
a = 30×9 = 270
the area is 270 sq m.
to find each unknown side length. then fill in the blanks.
90 sq cm.

1. the area is 420 sq m.

7 m
equation:
b =
the unknown side length is m.
h is cm.

Explanation:

Step1: Recall area formula

The area formula for a rectangle is $A = l\times w$, where $l$ is the length and $w$ is the width.

Step2: Solve for unknown side in fourth - problem

Given $A = 420$ square meters and $w = 7$ meters. Using the formula $A=l\times w$, we can rewrite it to find $l$ (in this case $b$) as $b=\frac{A}{7}$. Substituting $A = 420$ into the equation, we get $b=\frac{420}{7}=60$ meters.

Answer:

The unknown side length in the fourth problem is 60 m.