More than just a worksheet, the resource provides a thorough guide to navigate through the land of parallelograms. Filled with definitions and theorems, the resource supports learners through problems such as proofs and finding missing...

Given different parallelograms, geometers make conjectures about their properties. They then work in small groups to prove (or disprove) their conjectures. The activity provides many opportunities for making conjectures and critiquing...

Use rectangles to find distances. Given a rectangle and three associated triangles, pupils determine the area of the triangles. Scholars know the three triangles have equal areas along with the perimeter of the rectangle and two other...

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...

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.

Properly organize parallelograms. Given special parallelograms, the narrator of a short video explains the properties of each. The section of a playlist on geometry uses the properties to classify the special parallelograms.

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...

Properties spawn from parallel sides. With the aid of diagrams, the presentation shows the different properties of parallelograms. The segment of an extensive geometry playlist lists the properties that using the parallel sides of a...

If it has the properties of a parallelogram, it must be a parallelogram. A segment of a playlist on geometry presents the converses of the properties of a parallelogram. Given a quadrilateral with specific characteristics, the video...

See how parallelograms can produce congruent triangles. Given a diagram of a parallelogram, scholars must show that two triangles are congruent. The triangles are made from the diagonals of the parallelogram.

Cut straight to the proof. Given cutouts of different quadrilaterals, pupils draw diagonals. Learners cut up the figures along the diagonals to see whether they bisect each other. Scholars develop a geometric proof for the property they...

Pupils use a parallelogram containing intersecting line segments to identify two similar triangles. They justify the similarity and use it to find a missing length.

Classify this resource into the "Use" pile. Scholars use an interactive coordinate plane to plot polygons given coordinates for the vertices. They use properties to classify each polygon and answer a few challenge questions regarding the...

Verify a figure by using coordinates. Pupils calculate the coordinates of the midpoints of the sides of a quadrilateral. They then use the coordinates to show the resulting figure is a parallelogram. 

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...

Four is the perfect number—if you're talking about parallelograms. Scholars determine a possible fourth vertex of a parallelogram in the coordinate plane given the coordinates of three vertices. They read a conversation...

Geometric figures are perfect to use for proofs. Scholars prove conjectures about whether given points lie on a triangle and about midpoints. They use a provided dialogue among fictional learners to frame their responses.

Opposite angles in a parallelogram aren't opposites, so what are they? Scholars prove that opposite angles of a parallelogram are congruent. A two-column proof might be appropriate here.

Using a measuring tape isn't a proof strategy, is it? Scholars describe how to prove whether a quadrilateral with congruent opposite sides is a rectangle. The only tool available is a measuring tape.

What's my shape? The short assessment provides the coordinates of the four vertices of a quadrilateral. Pupils use what they know about special quadrilaterals to determine whether the figure is a parallelogram, rhombus, rectangle,...

Combine algebra skills and geometry knowledge to find the measure of angles in a parallelogram. The resource presents algebraic expressions for two angles of a parallelogram. Pupils determine the relationship of the two angles to create...

Flip, turn, and slide about the coordinate plane. Pupils define the rigid motions and experiment with them before determining the relationships of the slopes of parallel and perpendicular lines. The sixth unit in a nine-part series...

What type of quadrilateral is that? Discover the difference between the types of quadrilaterals. Small groups investigate types of quadrilaterals using geometry software to find their properties. To keep track of the different...

What figure is formed by connecting the midpoints of the sides of a quadrilateral? The geometry assessment task has class members work through the process of determining the figure inscribed in a quadrilateral. Pupils use geometric...