Given the perimeter of a triangle and the lengths of two sides, students compose a missing addend equation to find the length of the unknown side
A. Identify the perimeter of a polygon
B. Measure and add to find the perimeter of a polygon
C. Find the perimeter of a triangle
D. Find the perimeter of a rectangle
E. Find the perimeter of a polygon
F. Find the perimeter of a pentagon
H. Find the length of an unknown side of a quadrilateral
I. Find the perimeter of a equal-sided polygon using multiplication