Calculate the Perimeter of Triangles with Missing Sides Printable Worksheet

This worksheet helps students practice finding the perimeter of triangles by calculating missing side lengths. Each problem presents a triangle with two side lengths and a total perimeter, requiring students to determine the unknown side. It supports understanding of perimeter as the sum of all sides and strengthens basic addition and subtraction skills in practical geometry contexts. The answer key is included for easy correction and learning.

This printable is targeted for use with 3rd grade and 4th grade students.

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MEMBER: https://www.abcplayground.com//worksheets-printable/math/geometry/perimeter/11786805051_perimeter-triangle-3.pdf

NON-MEMBER: https://www.abcplayground.com//worksheets-printable/math/geometry/perimeter/01786805051_perimeter-triangle-3.pdf