Question

find perimeter by measuring lengths mastery check what is the perimeter?

Explanation:

Step1: Measure length

The length of the rectangle is 12 cm as measured by the horizontal ruler.

Step2: Measure width

The width of the rectangle is 6 cm as measured by the vertical ruler.

Step3: Use perimeter formula

The perimeter formula for a rectangle is $P = 2(l + w)$, where $l$ is length and $w$ is width. Substitute $l = 12$ cm and $w = 6$ cm into the formula: $P=2\times(12 + 6)$.

Step4: Calculate perimeter

First, calculate the sum inside the parentheses: $12+6 = 18$ cm. Then, multiply by 2: $2\times18=36$ cm.

Answer:

36 cm