Concord Consortium
Three Rubber Bands
Stretch your mind about triangles. Given a triangle, scholars consider a smaller triangle formed when they stretch three rubber bands from each vertex to the opposite side. They determine the ratios of the areas and perimeters of the...
Curated OER
Distance Formula
Students watch teacher demonstration of distance formula, view non-collinear cities on maps, plot points on coordinate plane, evaluate square roots, compute distance between two points, and use Heron's formula to find area of triangles.
Curated OER
Area of Triangles
In this geometry worksheet, 10th graders calculate the area of right triangles using the Pythagorean Theorem combined with the area formula. There are 14 questions with an answer key.
Curated OER
Area Puzzles
In this area puzzle worksheet, students the area in square units of 3 triangles, then use those areas and line segments to find find the area of a different set of figures.
Curated OER
Perimeter and Area
In this perimeter and area instructional activity, students find area and perimeter of 9 triangles. A website reference is given for additional resources.
Curated OER
Area and Perimeter of Various Shapes
In this area and perimeter activity, students find each for 6 given shapes. A website reference for additional resources and an answer key are provided.
Curated OER
Perimeter and Area #6
In this perimeter/area worksheet, students find area and perimeter for a set of 9 triangles. A website reference is given for additional activities.
Mathematics Vision Project
Module 5: Modeling with Geometry
Solids come in many shapes and sizes. Using geometry, scholars create two-dimensional cross-sections of various three-dimensional objects. They develop the lesson further by finding the volume of solids. The module then shifts to finding...
Illustrative Mathematics
Hexagonal Pattern of Beehives
Young geometers and biologists investigate the math of nature in an activity that is just the bee's knees. Participants will study the tessellations of hexagons in a beehive, along with the natural rationale behind the specific shape....
Cord Online
Pyramids and Cones
Young mathematicians find the surface area and volume of a square pyramid and a cone. In what looks like a typical activity out of a textbook, you'll find an activity where learners find an unknown measurement of a pyramid or cone,...
Mathematics Vision Project
Module 7: Modeling with Geometry
Model good modeling practices. Young mathematicians first learn about cross sections and solids of revolution. They then turn their attention to special right triangles and to the Laws of Sine and Cosine.
Lane Community College
Review Sheets: Geometry
Full of problems with polygons, angles, lines, and triangles, your learners get a multi-page packet that provides all they need to know. It contains many of the standard problem types as well as some more challenging questions.
Teachers Network
A World of Symmetry: Math-Geometry
Define and identify the three basic forms of symmetry translation, rotation, and glides with your class. They cut out and arrange paper pattern blocks to illustrate symmetry, create a Cartesian graph, and design a rug with a symmetrical...
Curated OER
Leveled Problem Solving Areas of Triangles and Trapezoids
In this geometry worksheet, 6th graders calculate the area of triangles and trapezoids using the given formulas. They use the formulas to find measurements of lines that are part of the triangles and trapezoids.
Curated OER
Bermuda Triangle: Map Activity
In this Bermuda triangle learning exercise, learners complete a set of 4 questions using a given map of the Bermuda triangle. Answers are included on page 2.
Curated OER
Exploring Areas of Irregular Polygons
Students solve for the area of different polygons. In this geometry lesson, students identify and differentiate between regular and irregular polygons. They use properties of irregular polygons to solve problems.
Curated OER
Area, Perimeter, Circumference
Sixth graders use different measuring tools to measure area, perimeter, and circumference of different shapes. In this measurement lesson plan, 6th graders measure parallelograms, triangles, and circles.
Curated OER
Twenty-Five Measures of the Angles of a Triangle Problems
In this triangle worksheet, young scholars calculate the measures of the angles or the sums of the measures of the angles in twenty-five triangle problems and hands-on activities. The solutions are provided.
Curated OER
Triangles with Collinear Circumcenters
Students identify the circumcenter of a triangle. In this geometry lesson, students construct a perpendicular bisector using a straight edge and a compass. They differentiate between triangles and collinear points.
![Perimeter and Area of Triangles [C] Worksheet](http://content.lessonplanet.com/resources/thumbnails/217521/large/nzixnzgwlmpwzw.jpg?1414307429 "Perimeter and Area of Triangles [C] Worksheet")
Curated OER
Perimeter and Area of Triangles [C]
In this triangle worksheet, students find the perimeter and area for a set of 4 triangles. Answers and a link to additional worksheets are included.
![Perimeter and Area of Triangles [D] Worksheet](http://content.lessonplanet.com/resources/thumbnails/217522/large/nzixnzgxlmpwzw.jpg?1414307429 "Perimeter and Area of Triangles [D] Worksheet")
Curated OER
Perimeter and Area of Triangles [D]
In this triangle activity, students find the perimeter and area for a set of 4 triangles. Answers and a link to additional worksheets are included.
![Perimeter and Area of Triangles [E] Worksheet](http://content.lessonplanet.com/resources/thumbnails/217524/large/nzixnzgylmpwzw.jpg?1414307430 "Perimeter and Area of Triangles [E] Worksheet")
Curated OER
Perimeter and Area of Triangles [E]
In this triangle worksheet, students find the perimeter and area for a set of 4 triangles. Answers and a link to additional worksheets are included.
Curated OER
A Trying Triangle Problem
In this geometry instructional activity, students calculate the length of the sides of a given triangle. They also find the perimeter and area of the triangles given its side values. There is an answer key with this problem.
Curated OER
Why can't We Use SSA to Prove Triangles Congruent?
Students investigate triangles and congruences. In this geometry lesson plan, students differentiate between inductive and deductive reasoning. They differentiate between similar and congruent triangles.
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