Question

find the perimeter and area of a rectangle of cardboard measuring 12.3 cm by 18 cm
perimeter: cm
area: cm²
question help: post to forum

Explanation:

Step1: Recall perimeter formula

The perimeter formula of a rectangle is $P = 2(l + w)$, where $l$ is the length and $w$ is the width. Here $l = 18$ cm and $w=12.3$ cm.
$P = 2(18 + 12.3)$

Step2: Calculate perimeter

$P=2\times30.3 = 60.6$ cm

Step3: Recall area formula

The area formula of a rectangle is $A=l\times w$.
$A = 18\times12.3$

Step4: Calculate area

$A = 221.4$ $cm^{2}$

Answer:

Perimeter: $60.6$ cm
Area: $221.4$ $cm^{2}$