Question

find the perimeter around the figure by using the appropriate formula. (assume ( a = 9 mathrm{dm} ).)
( mathrm{dm} )

Explanation:

Step1: Recall the perimeter formula for an equilateral triangle

The perimeter \(P\) of an equilateral triangle is \(P = 3a\), where \(a\) is the side - length of the triangle.

Step2: Substitute the value of \(a\) into the formula

Given \(a = 9\) dm. Substitute \(a = 9\) into \(P = 3a\), we get \(P=3\times9\).

Step3: Calculate the result

\(3\times9 = 27\)

Answer:

\(27\)