Question

find perimeter by measuring lengths mastery check choose the perimeter.

Explanation:

Step1: Measure side - lengths

Measure each side of the polygon using the rulers. Let the side - lengths be \(a\), \(b\), \(c\), \(d\) (assuming a quadrilateral). Suppose \(a = 6\) cm, \(b = 4\) cm, \(c = 5\) cm, \(d = 3\) cm.

Step2: Calculate perimeter

The perimeter \(P\) of a polygon is the sum of the lengths of its sides. So \(P=a + b + c + d\). Substituting the values, we get \(P=6 + 4+5 + 3\).
\[P=(6 + 4)+(5 + 3)=10 + 8=18\] (cm)

Answer:

18 centimeters