CK-12 Foundation
Area and Perimeter of Trapezoids: Lesson
With a little averaging, a trapezoid becomes a parallelogram. The section of an extensive geometry playlist shows how to derive the formula for the area of a trapezoid by changing it into a parallelogram. Using the formula, the video...
Flipped Math
Conditions for Rectangles, Rhombuses and Squares
Here's a special lesson about some special parallelograms. The fifth of seven parts in the Geometry - Quadrilaterals and Polygons unit focuses on the conditions for rectangles, rhombuses, and squares. Young mathematicians use these...
Curated OER
What is a Trapezoid?
There are many types of parallelograms, each having specific properties. A trapezoid is a special type of quadrilateral in that it has one pair, and only one pair, of parallel lines. Take a look at some of the other quadrilaterals and...
Krista King Math
Area of Trapezoids
Rectangles, parallelograms, and now trapezoids — so many quadrilaterals! Building on the previous lessons in the series, the video introduces the formula for the area of a trapezoid. The instructor shows images of trapezoids and those...
Corbett Maths
Vectors
Come in on a vector. A video introduces vector notation and basic definitions. Given a shortened version of representing the vector, the presenter shows how to add vectors algebraically. Using parallelograms and trapezoids, the resource...
Flipped Math
Properties of Rectangles, Rhombuses and Squares
They're all parallelograms—but unique in their own special ways. Pupils view an instructional video to investigate the properties of rectangles, rhombuses, and squares. They use these properties to solve for missing sides or angles,...
MinutePhysics
Is it Better to Walk or Run in the Rain?
No umbrella? No jacket? No problem! Physics scholars learn the mathematical advantage to running in the rain. The narrator illustrates the factors of top rain and side rain and how position and speed influence these factors.
Curated OER
How Do You Find the Area of a Composite Figure?
Trying to find the area of a rectangle, a triangle, a circle, or a parallelogram? There are specific formulas to use to calculate the area of these shapes. But the given shape is not any of these. It's a composite shape, which means it...
Scholastic
Study Jams! Classify Quadrilaterals
Face the vertex of two-dimensional shapes and discover what each figure requires as part of its classification. With one shape per slide, learners see what makes each shape special and compare it to others with similar qualities.
Math Antics
Quadrilaterals
Introduce the class to the quad in quadrilaterals. The presentation provides the names and definitions for the basic special quadrilaterals. A graphic shows the connections between the types of quadrilaterals introduced. The video points...
CK-12 Foundation
Classifying Quadrilaterals in the Coordinate Plane: Lesson
Coordinate the classification of quadrilaterals. Given the definitions of special quadrilaterals, a portion of a geometry playlist highlights ways to classify a quadrilateral. The video takes information from figures on a coordinate...
Corbett Maths
Coordinates and Shapes
Where is the point? Given three points on the coordinate plane, the video walks through the steps to find the location of the fourth point to create a given special quadrilateral. The narrator first determines the coordinates of the...
Krista King Math
Area of Rectangles
A critical skill in mathematics is using formulas to solve problems. Learners see the area formula for rectangles applied to three different types of problems. The video instructor demonstrates problems represented with a diagram,...
Krista King Math
Area of Rectangles Using Sums and Differences
Use the formula for the area of a rectangle for more than just rectangles! Scholars see that they can use common area formulas to find the area of irregular shapes.
Corbett Maths
Names of Quadrilaterals
They've all got four sides, but some have more interesting properties. Scholars learn the names of quadrilaterals. They also explore some properties of these quadrilaterals, including congruent angles, congruent and parallel sides, and...
Corbett Maths
Angles in Quadrilaterals
Four angles hath quadrilaterals, but what be their measures? After watching a video, young mathematicians consider the interior angles of quadrilaterals. They see how to find missing angle measures using the properties of quadrilaterals.
PBS
Graffiti Art: Supplies
Just how much spray paint does a mural require? Using proportions, graffiti artists determine the amount of supplies needed to complete a mural. The creative resource shows how to determine the area of composite figures and uses that...
Flipped Math
Unit 5 Review: Quadrilaterals and Polygons
Yes, it will be on the test. Young mathematicians first view an educational video to refresh their memories about material from the unit. They then complete a review worksheet where they find the measures of interior angles of polygons,...
National Science Foundation
Science of NFL Football: Vectors
Map the velocity of a thrown football using physics! Learners study vector addition using a football scenario. Two vectors model the movement of the receiver and quarterback while the resulting vector describes the velocity of the...
CK-12 Foundation
Area of Composite Shapes: Lesson
To find the whole, add and subtract the pieces. A portion of a massive geometry playlist shows how to approach finding the area of a composite figure. The resource works with a couple different composite shapes to find their areas.
Khan Academy
Rhombus Diagonals
Delving into a proof that the diagonals of a rhombus are perpendicular to each other, this lecture evaluates the angles and sides of this figure. It would serve as a great test preparation activity.
Khan Academy
Speed Translation
Teaching young mathematicians to use consistent units in their expressions as well as numbers, Sal demonstrates several ways to translate speed units in pre-algebra. He encourages viewers to memorize common speed units, such as the...
Krista King Math
Area of a Triangle
Triangles are not all created the same. The instructor shows how to find the area of different types of triangles using the formula. She also includes an example requiring coordinate geometry.
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