Lesson Plan
Curated OER

Diagonals of Quadrilaterals

For Teachers 9th - 10th
Students find the diagonals of the quadrilaterals. In this geometry instructional activity, students identify and use properties of quadrilaterals. They define different parts of a quadrilateral shape.
Worksheet
Curated OER

All Around Triangles and Quadrilaterals

For Students 4th - 6th
In this triangle/quadrilateral worksheet, students use a centimeter ruler to draw triangles and quadrilaterals with given perimeters. Answers are included on page 2.
Interactive
Curated OER

Angles in a Quadrilateral

For Students 9th - 12th
In this online math worksheet, students determine the values of angles within a quadrillateral. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching...
Worksheet
Curated OER

Polygons and Quadrilaterals

For Students 4th - 7th
In this polygons and quadrilaterals practice worksheet, students sharpen their problem solving skills as they solve 6 story problems.
Worksheet
Curated OER

Challenge: Quadrilateral

For Students 4th - 6th
In this quadrilateral worksheet, students read about the measurements of a kite, then determine whether given figures are kites and explain why or why not. 
Worksheet
Curated OER

Quadrilaterals

For Students 9th - 10th
In this geometry worksheet, students identify the missing measures of rectangles and quadrilaterals. They use the properties of quadrilaterals to solve for the missing sides. There are 2 charts to be completed.
Interactive
Curated OER

Quadrilaterals Multiple Choice

For Students 9th - 10th
In this geometry worksheet, students identify the properties of quadrilaterals. they find the length of th sides and angles of quadrilaterals. There are 5 questions with an answer key.
Worksheet
Curated OER

Tests for Parallelograms Multiple Choice

For Students 8th - 10th
In this parallelogram worksheet, students examine the lengths of the sides of a quadrilateral.  They identify parallelograms.  This one-page worksheet contains 13 multiple-choice problems.  This online worksheet provides...
Lesson Plan
Curated OER

Shape Up

For Teachers 6th - 8th
Middle schoolers explore differents types of triangles and quadriaterals. In this polygon lesson, students  model identify and compare two and three dimensional geometric figures. Middle schoolers create tangrams and discover the...
Lesson Plan
Curated OER

Investigating Area Relationships

For Teachers 9th - 12th Standards
Learners investigate the area of various figures. They construct triangles and quadrilaterals using Cabri Jr. and discuss the relationships between different angles, side lengths, and figures.
Worksheet
Curated OER

Using Triangles To Make Shapes

For Students 3rd - 4th
In this using triangles worksheet, students create quadrilaterals and hexagons. In this problem solving worksheet, students draw as many quadrilaterals and hexagons as possible.
Lesson Plan
Curated OER

I. M. Pei and the Geometry of the NGA

For Teachers 5th - 8th
Students compare design elements in neoclassical and modern architecture. They review knowledge of triangles and quadrilaterals and design a geometric pattern using Pei's polygons They create a city plan using a variety of lines and...
Lesson Plan
Curated OER

Basic Shapes

For Teachers 11th - 12th
Students create books about shapes.  In this shape lesson, students select a topic such as points, lines, angles, planes, polygons, quadrilaterals, triangles, circles, and polyhedra.  In groups, they create an illustrated...
Worksheet
Curated OER

Midpoint of a Line Segment

For Students 10th
In this line segment activity, 10th graders identify and solve 10 different problems that include determining the midpoint of a line segment in each. First, they determine the midpoint of a segment that connects two points. Then,...
Lesson Plan
Curated OER

Finding Areas of Triangles, Rectangles, and Circles

For Teachers 9th - 10th
Students find the areas of geometric shapes. In this geometry lesson students find and measure the sides, perimeters, and areas of quadrilaterals, triangles, and circles. Students relate the measures to the others by using formulas.
Activity
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Illustrative Mathematics

A Midpoint Miracle

For Teachers 9th - 12th Standards
Young geometers develop one of the fundamental properties of quadrilaterals (connecting side midpoints gives a parallelogram) in this short but thought-provoking exercise. Using a combination of hands-on techniques and abstract algebraic...
Lesson Plan
EngageNY

Ptolemy's Theorem

For Teachers 9th - 12th Standards
Everyone's heard of Pythagoras, but who's Ptolemy? Learners test Ptolemy's Theorem using a specific cyclic quadrilateral and a ruler in the 22nd installment of a 23-part module. They then work through a proof of the theorem.
Unit Plan
Mathematics Vision Project

Module 1: Transformations and Symmetry

For Teachers 9th - 12th Standards
No need to change anything about the resource. The first of eight modules in the MVP Geometry unit focuses on transformations in the coordinate plane. It connects translations, rotations, and reflections to congruence, symmetry, and...
Worksheet
Curated OER

Properties of a Quadrilateral

For Students 10th
In this geometry worksheet, 10th graders use coordinate geometry to examine the lengths, slopes, and midpoints of the diagonals of the different quadrilaterals in order to arrive at conclusions regarding the properties of the diagonals....
Unit Plan
Mathematics Vision Project

Transformations and Symmetry

For Teachers 9th - 10th Standards
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...
Lesson Plan
Willow Tree

Common Geometric Figures

For Students 8th - 11th Standards
Geometry could be called the study of figures. An overview of the figures found in a typical geometry course contains a study of different triangles, quadrilaterals, and regular polygons. 
Assessment
Mathematics Assessment Project

Floor Pattern

For Students 9th - 11th Standards
You'll never look at floor tiles the same again. An assessment task prompts learners to investigate relationships between patterns involving squares and kites to determine angle measurements. They then prove...
Assessment
Illustrative Mathematics

Polygons

For Students 2nd Standards
Identify shapes based on their attributes. Second graders are tasked to color triangles, quadrilaterals, pentagons, and hexagons specific colors. The one thing these shapes have in common? They are all polygons.
Lesson Plan
Curated OER

Quadrilateral Explorations

For Teachers 9th
Ninth graders identify quadrilaterals and label the vertices of quadrilaterals. they justify their identification of the quadrilaterals. Students work in groups to identify and create quadrilaterals

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