Question

find perimeter by measuring lengths mastery check find the perimeter.

Explanation:

Step1: Measure side lengths

Let the three - side lengths of the triangle be \(a\), \(b\), and \(c\). By measuring with the ruler, assume \(a = 7\) cm, \(b = 6\) cm, \(c = 5\) cm.

Step2: Calculate perimeter

The formula for the perimeter \(P\) of a triangle is \(P=a + b + c\). Substitute \(a = 7\), \(b = 6\), \(c = 5\) into the formula: \(P=7 + 6+5=18\) cm.

Answer:

18 cm