Question

use a two - dimensional model and the dimensions provided to calculate the perimeter and area of the top of the sandwich. round to the nearest tenth, if necessary. perimeter = cm area = cm²

Explanation:

Step1: Recall perimeter formula

The perimeter $P$ of a triangle is the sum of its side - lengths. Given side - lengths $a = 10.8$ cm, $b = 6.6$ cm, and $c = 8.4$ cm.
$P=a + b + c$

Step2: Calculate the perimeter

$P=10.8+6.6 + 8.4=25.8$ cm

Step3: Recall area formula

The area $A$ of a triangle with base $b$ and height $h$ is $A=\frac{1}{2}bh$. Here, if we take the base $b = 6.6$ cm and height $h = 8.6$ cm.
$A=\frac{1}{2}\times6.6\times8.6$

Step4: Calculate the area

$A = 28.38\approx28.4$ $cm^{2}$

Answer:

perimeter = $25.8$ cm
area = $28.4$ $cm^{2}$