Video lesson explores how to find the length and width of a rectangular table given the perimeter and area. [4:45]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Video tutorial introduces the area of a rectangle and discovers a formula for the area of a right triangle. [4:44]

Students find the area of rectangles, triangles, parallelograms, and trapezoids by using formulas or by composing into rectangles or triangles.

Students use the area formula for rectangles to solve real world and mathematical problems.

This site provides six practice activities to learn how to partition a rectangle into rows and columns of same-size squares and count to find the total number of them.

Rectangle is SO MUCH like triangle! Those darned angles--they'll get beginning learners! This is a fun way to practice rectangle!

Coordinate geometry of rectangles is investigated in this video lesson. The tutorial demonstrates how to use the midpoint, distance, and slope formulas to determine if a quadrilateral is a rectangle on a coordinate plane. [17:26]

This lesson [8:39] will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a rectangle in a coordinate plane. It is 1 of 5 in the series titled "Coordinate Geometry of Rectangles."

This challenging problem and brainteaser gives first graders an opportunity to compose and decompose squares.

Sal determines if shapes are divided into 2 or 4 equal sections.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Models how to multiply fractional side lengths given in metric units to find the area of rectangles. [3:46]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Demonstrates using a visual model different methods for determining the area of a rectangle where the side lengths are fractions. Uses metric units. [7:02]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Examines special parallelograms. Students learn about a rectangle, rhombus, and square. Definitions and examples with solutions are included.

Explains the basic concept of the perimeter of geometric shapes with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Explains the basic concept of a rectangle with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

This lesson contrasts area and perimeter and has varied exercises for students about both concepts.

This lesson presents the idea that the area of any right triangle is exactly half of a certain rectangle, and contains varied exercises for students.

This fifth-grade lesson explores the area of a rectangle with fractional side lengths. We tile the rectangle with unit rectangles and show that the area is the same as would be found by multiplying the side lengths. We multiply fractional side lengths to find areas of rectangles.

Brush up on your math skills relating to the area of rhombuses then try some practice problems to test your understanding.

Brush up on your math skills relating to perimeter then try some practice problems to test your understanding.