This amazingly extensive unit covers a wealth of geometric ground, ranging from constructions to angle properties, triangle theorems, rigid transformations, and fundamentals of formal proofs.  Each of the almost-forty lessons is broken...

Middle and high schoolers construct a triangle using Cabri Jr. They construct squares on each of the legs and hypotenuse of the triangle. Pupils show that the area of the squares on the leg equal the area of the square on the hypotenuse.

Tenth graders investigate dilations and explore the dilation transformation before investigating the properties of a dilation using Cabri Jr. Learners extend the concept of dilatation to the coordinate plane.

Mark off the length of the radius around the circle. Using a compass, the presenter shows how to construct a regular hexagon in a circle. Pupils see how triangles formed in the hexagon are equilateral, allowing for the construction to...

Creating a 60-degree angle also creates an equilateral triangle. By watching the video, individuals learn the steps required to construct a 60-degree angle. The presentation shows that the process is the same for constructing an...

Construct yourself a winning geometry unit. A set of lessons introduces geometry scholars to constructions and proofs with compasses and straightedges. It also covers triangle congruence through transformations. This is the second of...

Colorado would probably object if Wyoming enlarged its borders. Scholars use an interactive map to change the borders of U.S. states to see how angles change. They then answer questions about regular and irregular polygons.

With a little imagination, you can make these construction tools work, too. A creative lesson plan builds upon the knowledge of construction tools to come up with other tools to use. Pupils learn how to construct a regular hexagon...

Once one is created, keep duplicating it until the construction is complete. Pupils use the power of a dynamic geometry software program to construct an inscribed regular hexagon within a circle. The scholars create equilateral triangles...

A prescription for inscribing polygons makes for an interesting lesson. Individuals follow a set of written instructions to construct both an equilateral triangle and regular hexagon inscribed in a circle. An extra handout allow learners...

Circles and squares come together and share important characteristics. Using the properties of a square, scholars develop a procedure for constructing a square inscribed in a circle. Connecting square properties to angles within a circle...

Construct regular polygons using a circle as a guide. Scholars learn the process of inscribing regular polygons inside a circle using the central angle method. They practice their constructions on a variety of circles.

This is much easier than putting a square peg in a round hole. Scholars use geometric construction methods to create an inscribed square in a circle. The preferred method for this worksheet is using a compass and straightedge.

Sometimes a compass and straightedge are the correct tools for the job. Scholars use a given line segment to make geometric constructions. These include constructing a copy of the line segment, constructing an equilateral triangle, and...

Meet your class in the middle using a well-rounded formative check! Geometry scholars use a compass and straight edge to construct the center of a circle. Students justify the steps they took to perform the construction through...

I thought compasses could only draw circles! Scholars draw an equilateral triangle inscribed in a given circle. They accomplish this by using a compass and straightedge as the solution strategy.

Learn about constructing figures, proofs, and transformations. The seventh unit in a course of nine makes the connections between geometric constructions, congruence, and proofs. Scholars learn to construct special quadrilaterals,...

Examine the origin and application of pi in five different levels. The five lessons in the resource begin with an analysis of the relationship between the radius and circumference of a circle. The following lessons lead learners through...

Pupils learn the steps for basic constructions using a straightedge, a compass, and a pencil. Pairs develop the skills to copy a segment and an angle, bisect a segment and an angle, and construct parallel and perpendicular lines.

Have you hit a wall when trying to create performance task questions? Several open-ended response questions require a deep level of thinking. Topics include triangle congruence, quadrilaterals, special segments, constructions, and...

Is the amount of information getting overwhelming for your geometry classes? Use this strategy as a way to organize information. The resource provides a handout of information studied in relation to triangle congruence. It includes a...

How hard can it be to split something in half? Learners investigate how previously learned concepts from angle bisectors can be used to develop ways to construct perpendicular bisectors. The resource also covers constructing a...

More constructions! In this third installment of a 36-part series, learners watch a YouTube video on creating door trim to see how to bisect an angle. They then investigate how to copy an angle by ordering a given list of steps.