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Khan Academy

Khan Academy: Measure to Find Perimeter

For Students 3rd - 5th
Practice measuring side lengths to find perimeter.
Unit Plan
Khan Academy

Khan Academy: Find Perimeter by Counting Unit Squares

For Students 3rd - 5th Standards
In this exercise, students practice find the perimeter of shapes by counting unit squares. Students receive immediate feedback and have the opportunity to watch a video tutorial, get hints, and try questions repeatedly.
Interactive
Shodor Education Foundation

Shodor Interactivate: Lesson: Perimeter (Elementary)

For Teachers 3rd - 5th Standards
In this lesson students will practice finding the perimeter of regular and irregular shapes with right angles and the appropriate units for measuring perimeter.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 17.5 Sine to Find the Area of a Triangle

For Students 9th - 10th Standards
Learn how to sine to find the area of a triangle.

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