Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Perimeter
Find a quick, concise explanation of perimeter. Perimeter formulas are given for common plane figures.
Other
Basket Math: Perimeter Practice
Use this interactive site to practice finding the perimeter of a square.
Houghton Mifflin Harcourt
Holt, Rinehart and Winston: Homework Help: Perimeter and Area of Triangles and Trapezoids
Get independent practice working with finding the perimeter and area of triangles and trapezoids. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
Illustrative Mathematics
Illustrative Mathematics: 8.g Areas of Geometric Shapes With the Same Perimeter
Eighth graders are shown three polygons with equal sides and a circle. They are asked to find the area of each when the perimeter is one unit and to order them from smallest area to largest. Aligns with 8.G.B.7.
CK-12 Foundation
Ck 12: Geometry: Area and Perimeter of Triangles
[Free Registration/Login may be required to access all resource tools.] In this lesson students use formulas and given information to figure out the dimensions and the area of different triangles. Students examine guided notes, review...
Khan Academy
Khan Academy: Find Area With Partial Unit Squares
Count unit squares and partial unit squares to find the area of shapes.
Other
Pennsylvania Standards Aligned System: Using Expressions and Equations
This lesson provides students with opportunities to practice writing equivalent equations and expressions for finding perimeter and patterns on a calendar. It also gives extension and remediation ideas as well as related instructional...
Alabama Learning Exchange
Alex: Perimeter of Polygons
The purpose of this lesson is to learn how to find the length, or perimeter of a polygon in real world tasks.
Discovery Education
Discovery Education: Web Math: Find Out Things About a Right Triangle
Gives basic info about a right triangle. Also students can substitute values for sides or angles in order to find missing values. The method for solving is then explained.
Alabama Learning Exchange
Alex: Swimming Pool Math
Students will use a swimming pool example to practice finding perimeter and area of different rectangles.
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 1
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 1 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
CK-12 Foundation
Ck 12: Geometry: Area and Perimeter of Similar Polygons
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the ratios of the perimeters and areas of similar polygons. Students examine guided notes, review guided practice, watch instructional...
National Council of Teachers of Mathematics
The Math Forum: Perimeter of an Oval
What seemingly ought to be straghtforward is not always the case. Dr. Math, in reply to a class question, points this out when discussing how to find the perimeter of an ellipse. Some links to websites that help with the computation are...
Other
Algebra Lab: Areas and Perimeters of Triangles and Special Quadrilaterals
Learn how to find the areas and perimeters of triangles and special quadrilaterals.
Discovery Education
Discovery Education: Web Math: Find Out Things About a Square
WebMath will calculate the side length, diagonal length, perimeter, area, or volume, given the side, perimeter, diagonal, or area. This site also displays formulas for a square.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Area Builder
Create shapes using colorful blocks, and explore the relationship between perimeter and area. CCSS.Math.Content.3.MD.C.7.a Find the area of a rectangle with whole-number side lengths by tiling it
Better Lesson
Better Lesson: Design a Space Using Area Models Day 1 and Day 2
Third graders use area models to find the total area of a store, home, or other real world space.
Maths Challenge
Maths challenge.net: Running Requirements
A "two star" problem, requiring some knowledge of calculating circumferences and use problem solving skills to solve. Solver will find upper and lower bounds in the problem.
CK-12 Foundation
Ck 12: Elem Math: Partitioning Composite Figures Into Rectangles to Find Area 1
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are asked to partition a shape into rectangles and add their areas together to get the area of the whole figure. Includes video...
Khan Academy
Khan Academy: Find Base and Height on a Triangle
Identify the height of a triangle when given the base. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Better Lesson
Better Lesson: Finding the Area of a Rectangle
Sixth graders use the area formula for rectangles to solve real world and mathematical problems.
Maths Challenge
Maths challenge.net: Perimeter Sequence
A "one star" geometry problem that requires finding the visual pattern and applying logic with basic math skills to find the perimeter from the sequence.
CK-12 Foundation
Ck 12: Geometry: Applications of the Pythagorean Theorem
[Free Registration/Login may be required to access all resource tools.] In this lesson students use the Pythagorean Theorem to find perimeter and area. Students examine guided notes, review guided practice, watch instructional videos and...
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