What does it take to show two triangles are similar? The 11th segment in a series of 16 introduces the AA Criterion for Similarity. A discussion provides an informal proof of the theorem. Exercises and problems require scholars to apply...

Now this lesson plan sounds fun! High schoolers throw a ball, film it as it soars through the air, and use a spreadsheet to collect data. A scatterplot is created to produce a quadratic regression equation, an equation in vertex form,...

The message that buying things brings happiness is everywhere. Teenagers are not immune to this marketing strategy and benefit from reflecting on the relentless pressure to spend. This exercise invites young adults to consider the value...

"I all alone beweep my outcast state." After a discussion of the "Shakespeare in American Life" segment in which Maya Angelou's relates her reaction to Sonnet 29, class groups create and perform a scene about an outcast that includes the...

Beginning biologists learn the characteristics of the five classes in the arthropod phylum. A student handout lists characteristics to help them identify five specimens. You will need to collect an example of each: arachnida, crustacea,...

Eleventh graders compile a list of places in the United States where they have either traveled or where their relatives or friends live. They collect travel posters, brochures, postcards, and maps from their region of the United States.

Class groups collaborate to produce the storyboard for their video project. After determining the sequence of scenes, the camera angles, and characters in each scene, each group member is assigned a number of scenes to illustrate. When...

Use the graphs of the trigonometric functions to set the stage to inverse functions. The lesson reviews the graphs of the basic trigonometric functions and their transformations. Pupils use their knowledge of graphing functions to model...

Remember all those credit card tables lined up on your college campus? So alluring and dangerous, if you don't know what you're doing. Prepare your pre-college attendees for life by offering a lesson plan on credit management. They...

Students define slope, and practice finding the slope of lines through given points. They determine the angle of inclination. Students find the relationship between the slope and the tangent of the lines. Students determine special...

Students find the perimeter and area of circles, triangles, and rectangles. In this perimeter and area lesson plan, the teacher gives students formulas for each shape and measurement and works through examples on the board. While no...

Middle schoolers, when given the name of a community, identify a food, a craft, a custom, language and music, unique to that community 100% of the time. They find similarities and differences between this community and their own in four...

Learners identify and use the similarity theorem. In this geometry lesson, students differentiate between congruent and similar triangles. They solve problems using the computer modifying shapes by dragging.

Students find the median of trapezoids and other polygons. In this geometry lesson, students identify important properties of trapezoids. They create trapezoids and polygons using Cabri software.

Students explore the globe. In this globe skills instructional activity, students use their knowledge of latitude and longitude to respond to questions regarding Christopher Columbus's maiden voyage to the Americas.

In this circles worksheet, 10th graders solve and complete 8 different problems. First, they find the two segments perpendicular to a given circle. Then, students find the line tangent to the circle illustrated and the sides marked. They...

Ninth graders investigate the segment addition postulate.  In this geometry lesson, 9th graders explore the difference between equal and congruent in relation to segment length.  The lesson includes an algebra application and a...

Student identify the solution using geometric mean. In this geometry lesson, students create right triangles where the altitude of the triangle is the side containing the right angle. They modify shapes using Cabri software and observe...

In this geometry worksheet, students calculate the midpoint and distance between two points. They use the correct formula to solve the area and perimeter of polygons. There are 20 multiple choice questions with an answer key.

Students identify the relationship between chords, secants and circles. In this geometry lesson, students calculate the length of the chords. They sketch the secant lines on a circle.

Learners construct perpendicular lines. For this geometry lesson, students use a compass and straight edge to do construction. They start from a point to a line.

Students identify properties of trapezoids. In this geometry lesson, students are put into groups and use computer programs to analyze polygons. They drag and move the shapes around as they make predictions.

In this printing activity, learners form the upper and lowercase letter U. Students also color in two pictures that begin with the letter U.

Students identify different parts and properties of circles. In this geometry lesson, students identify the radius, diameter, semicircle and inscribed angle of a circle. They identify the tangent lines to a circle.