Question

at school, akihiro draws a model of the flag of japan in the coordinate plane. what is the perimeter of the flag akihiro draws?
24 units
10 units
35 units
20 units

Explanation:

Step1: Find length of rectangle

The horizontal side spans from $x=3$ to $x=9$.
Length $l = 9 - 3 = 6$ units

Step2: Find width of rectangle

The vertical side spans from $y=2$ to $y=6$.
Width $w = 6 - 2 = 4$ units

Step3: Calculate perimeter

Use rectangle perimeter formula $P=2(l+w)$.
$P = 2\times(6 + 4) = 2\times10 = 20$

Answer:

20 units