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This worksheet gives learners the opportunity to practice measuring lengths in millimeters and then add those lengths to find the perimeter of a shape. Section A gives some triangles where learners will need to measure all three sides. Section B then gives some rectangles, giving learners the option to measure the length and width if they wish to then go on to calculate the perimeter. Section C then provides a mixture of quadrilaterals, pentagons, and rectilinear shapes.