Question

find the value of y. perimeter = 66 millimeters y = millimeters

Explanation:

Step1: Recall the formula for perimeter of a triangle

Perimeter of a triangle \( P=a + b + c\), where \(a,b,c\) are the side - lengths. Here \(P = 66\) mm, \(a=y\), \(b = 22\) mm, \(c = 22\) mm. So, \(66=y + 22+22\).

Step2: Simplify the right - hand side

\(y+22 + 22=y + 44\). The equation becomes \(66=y + 44\).

Step3: Solve for \(y\)

Subtract 44 from both sides of the equation. \(y=66 - 44\).

Answer:

\(22\)