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Lesson Plan
Curated OER

Triangles

For Teachers 6th - 10th
Pupils identify triangles in the real world and construct their own triangle using drinking straws. They explore abstract triangles and find additional geometric shapes such as trapezoids. Students discuss similar shapes and examine the...
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PPT
Curated OER

Classifying Triangles

For Teachers 5th - 7th
This presentation shows how triangles are classified by angle measurement and length of sides.  It reviews isosceles, scalene, obtuse, right, and acute classifications and includes questions for students to classify some of the triangles...
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Worksheet
Curated OER

Number & Operations

For Students 8th - 9th
For this number and operations worksheet, learners solve and complete 3 different sections of one problem that uses the Pythagorean theorem to solve. They use the model illustrated to determine the meaning of the Pythagorean theorem....
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Interactive
Curated OER

Angles in a Triangle

For Students 9th - 12th
In this online math learning exercise, students calculate the angles in a triangle given their measurements. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A...
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Lesson Plan
Curated OER

Perimeter of Triangles and Rectangles

For Teachers 5th
Fifth graders study perimeter. In this math instructional activity, 5th graders use Cheerios to find the perimeter of various polygons. Students discuss how to figure the perimeter of triangles, squares and rectangles.
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Lesson Plan
Curated OER

Delta, Delta, Delta

For Teachers 9th - 12th
Students construct equilateral triangles and a 'laser' triangle.  In this reflection instructional activity students build a retro-reflector using mirrors.
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Lesson Plan
Curated OER

Shapes...the Beginning of Geometry

For Teachers K - 1st
Students identify and name basic shapes and points. In this elementary geometry lesson, students use printable cut outs to name circles, triangles, and squares before playing a game with them. They play a game of "Pin the Tail on the...
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Worksheet
Curated OER

Rotations

For Students 5th - 10th
For this rotations worksheet, students draw and label a rotated image for each triangle and label its center. Students complete 6 problems.
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Worksheet
Curated OER

Dilations

For Students 6th - 10th
In this dilations activity, students draw and label dilated images for the triangles and label the centers. Students complete 6 problems total.
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Interactive
Curated OER

Identifying Triangles

For Students 10th
In this geometry worksheet, 10th graders identify a triangle as right, acute, or obtuse and identify the parts of a right triangle in a drop and drag game format.  The one page interactive worksheet contains eight matching questions and...
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Worksheet
Curated OER

Area of Triangle Worksheet

For Students 5th - 6th
In this area worksheet, students find the area of a triangle given the height and the base. They also find the height or base given the area of the triangle. 
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Worksheet
Curated OER

Geometry Practice: G.G. 28 #2: Triangle Congruence

For Students 10th - 12th
In this triangle congruence activity, students use SSS, ASA, AAS and HL to determine the congruence of triangles.  They identify the theorem that proves congruence.  This three-page activity contains 4 multi-step problems.  Answers are...
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Worksheet
Curated OER

Area Problem

For Students 8th - 12th
In this area problem, students solve a problem of the week.  They determine the area of a given figure.  This one-page learning exercise contains 1 problem.  A detailed explanation to find the answer is provided.
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Worksheet
Curated OER

Math Club Warm Up #17b

For Students 6th
In this area activity, 6th graders solve 2 problems about area, one with a square and one with a triangle; there are 4 sheets on a page.
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Worksheet
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SAT Grid Practice Test 11

For Students 9th - 11th
In this SAT practice test, students compute the area and perimeter of polygons.  They determine the volume of a cylinder and solve problems with exponents.  This one-page worksheet contains 10 problems.  Answers are provided.
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Lesson Plan
Curated OER

The Greedy Triangle

For Teachers 3rd - 4th
Students discuss figures with various numbers of sides.  For this geometry lesson, students are read The Greedy Triangle by Marilyn Burns, they participate in a class discussion of many sided figures and are introduced to the term...
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Worksheet
Curated OER

Triangle: Print and Color

For Students Pre-K - 1st
In this word recognition worksheet, learners trace the word "triangle", write the word independently, and color the picture of the triangle.
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Lesson Plan
Curated OER

Formula Determination

For Teachers 9th - 12th
Students derive a formula for the interior degrees in any convex polygon. In this geometric figure lesson, students determine the shapes of various polygons and the number of triangles formed. They use this information to derive the...
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Lesson Plan
Curated OER

Altitude Locator

For Teachers 9th - 12th
Students use protractors, strings, and straws to construct a device used to determine the height of tall objects. In this applied geometry lesson, students use common objects to construct a tangent height guide. They use principles of...
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Worksheet
Curated OER

Find the 2D shape

For Students 2nd - 4th
In this 2D shapes worksheet, students find the rectangular prism, triangular prism, pentagon, and triangle. Students have 3 shapes to choose from in each of the 4 problems.
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Worksheet
Curated OER

Geometry

For Students K - 6th
In this geometry instructional activity, students determine what if 6 different shapes are a circle, square, triangle or a rectangle. Students bubble in their answers.
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Worksheet
Curated OER

Identifying Shapes: Cubes, Triangles, Cones and Spheres

For Students 4th - 6th
For this identifying shapes worksheet, students tell which shapes in sets are named, choosing from cube, triangle, cone or sphere. A reference web site is given for additional activities.
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Lesson Plan
Curated OER

Let's Explore the World of Triangles and Quadrilaterals!

For Teachers 2nd
Second graders explore the features of triangles and quadrilaterals. In this lesson on triangles and quadrilaterals, 2nd graders rotate with their group to five different activities all exploring a different aspect of geometry.
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Worksheet
Curated OER

Shapes

For Students Pre-K - 1st
In this learning shapes activity, students practice their fine motor skills as they trace the square, triangle, rectangle, and circle shapes.