New ReviewClassify quadrilaterals quickly. After playing a game to identify quadrilaterals, your young scholars should come away with knowledge of the properties of quadrilaterals. They then apply this knowledge to create a decision tree to ease...

New ReviewSliding over a corner makes a rectangle. The resource demonstrates why the formula of the area of a parallelogram works. As part of a larger playlist on basic geometry, the video works examples dealing with parallelogram areas.

Build similar figures from congruent ones. The lesson introduces the concept of rep-tiles. Pupils show that given figures are rep-tiles and discuss the difference between composing and decomposing the tiling patterns.

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.

More than just a rectangle that's been pushed around, parallelograms present their own unique challenges! The third instructional activity in a four-part series of area formula lessons examines the quirky parallelogram. Geometry scholars...

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...

Explore the unique patterns of mathematics with a parallelogram activity. Young scholars use geometry software to partition a parallelogram into four unique parallelograms. They then measure the sides and calculate the area of each...

Begin from the inside and work outward. Pupils construct quadrilaterals based upon the descriptions of the diagonals. Pairs then work through several configurations of diagonals and determine the types of quadrilaterals they can form....

Geometric figures are only a fold away. Using origami techniques, pupils create parallelograms, all while examining and calculating angle measurements and lengths of folds along the way. Learners connect eight parallelograms to form an...

Common traits often bring people together; this is true for quadrilaterals, too. Pupils get together in groups based on index cards showing quadrilaterals, which they receive as they enter the classroom. They decide what the...

Who killed the Circular family? Learners tackle an unsolved murder of the Circular family. Given a list of descriptions of the culprit, pupils narrow down their list of suspects to find the killer. The descriptions involve properties of...

Four sides hath rhombi, rectangles, squares, trapezoids, and parallelograms. Scholars learn different classifications of quadrilaterals by watching a short video from the Socratica Geometry series. They see how sides and angles help...

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.

Here are two tasks for a three-sided figure. Scholars complete some problems given a triangle. The first is to show that a quadrilateral drawn with midsegments of the triangle is a parallelogram. The second is to find the perimeter of...

Back to the original figure. Young mathematicians consider transformations that carry figures onto themselves. The figures in question are a parallelogram and a rhombus.

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...

What conditions must be met for a quadrilateral to be a parallelogram? A slider interactive allows individuals to move the vertices of a quadrilateral. They answer questions that prove whether a given quadrilateral is a parallelogram.

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.

Find two similar triangles in plane sight. Given a figure composed of a parallelogram and a triangle, pupils identify two similar triangles and provide an explanation. Class members use the similar triangles to find two missing side...

Let an informative resource on side congruence be on your side. Pupils prove that a given parallelogram has congruent sides with a two-column proof. They must apply triangle congruence, angle relationships, and properties of congruence...

Take the time to prove what seems obvious. The resource provides pupils a figure of a rectangle, which they use to develop a proof showing that the rectangle is also a parallelogram. Scholars must rely on the definition of a rectangle to...

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.