What shapes classify as a polygon? The resource provides the definition of a polygon and provides examples of polygons and shapes that are not polygons. The presentation gives an explanation of why each shape falls into the particular...

What makes a figure a polygon? Does it have three or more sides? Is it a closed figure? If the answer is yes to both of those questions then it's a polygon. But wait! Some of these polygons have special names based on the number of sides...

One base, triangular sides, and defined polygons are all parts of what make up a pyramid. Check out this video and see the instructor draw pictures of a variety of pyramids. She identifies the specific parts and gives them names based on...

Ty Burrell and Abby identify the characteristics of a hexagon. They discuss sides and angles. Through trial and error Abby finally identifies a hexagon.

Find the area of a trapezoid. The instructor goes through a discussion of defining a trapezoid, the ways to identify the height and base, and then calculates the area of the trapezoid. This visual exploration should solidify this concept...

A closed figure with four sides means it's a quadrilateral. Each of the different types of quadrilaterals have special properties. The instructor in this video explains the special properties of a rhombus. Parallel sides and congruent...

There are three variables in the formula for a parallelogram. Two of the values are given in this problem. Find the third value. Identify what each of the variables means. Match up the given values to the variables. Then solve for the...

Find the height of a trapezoid given the values of the two bases and the area. First write out the formula for the area of a trapezoid. Then identify all the variables and match up the given values. Now plug the values into the formula....

Learn how to identify an equilateral triangle by evaluating its congruent sides. Once you've determined that that sides are congruent you'll be able to use the triangle sum theorem to determine the angles in an equilateral triangle. This...

Two-d or not two-d? That's not really the question because the figures here are all two-dimensional. Learners identify the names of polygons, starting with triangles and ending with decagons. The video also describes circles and...

A ray is a line that begins at an identified point and then goes on forever in one direction. The identified point is called the endpoint. There needs to be another identified point on the line to be able to identify the line as a ray....

Trapezoids can be tricky. Break down the process of finding the area of a trapezoid with this video! Viewers are given information about the area formula and shown exactly how to plug in information, solve, and simplify. This is a...

Trapezoids can be tricky! Break down the process of finding the area of a trapezoid with an engaging math video. Learners explore area formula and shown exactly how to plug in information, solve, and simplify. 

Finding the missing values of two angles in an isosceles triangle is not as difficult as it sounds. But how can two out of three angle's measurements be found? Well, there are special properties about an isosceles triangle which make...

Given an isosceles triangle, and the value of one angle, find the missing values. There are some special properties about isosceles triangles. Use the triangle sum theorem to solve this problem. Watch this video to see how the instructor...

The triangle sum theorem states that the interior angles of a triangle add up to 180 degrees. So it seems logical that if there are two known values given for the interior angles of a triangle, the third value could be found using this...

This tutorial explains the properties of a polygon, the names of the most popular polygons, and teaches how to identify polygons. [5:41]

This video [4:39] provides an opportunity to learn about the characteristics of polygons. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

Looks at 2D polygons and demonstrates how to find and show a line of symmetry. [5:32]

Looks at a collection of 2D shapes and discusses how to identify them based on their properties. [4:19]

Discusses how to identify basic 2D shapes by their properties. [6:08]

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on the properties of rectangles, squares, circles and triangles.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on the properties of various quadrilaterals.