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Worksheet
Curated OER

The Area of a Triangle

For Students 5th - 6th
In this area of a triangle worksheet, students solve 30 problems in which the area of triangles are calculated. There is instruction on the page. This is intended for on-line use but can be done on paper.
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Worksheet
Curated OER

Triangle Angle Sort

For Students 10th
In this triangle and angle instructional activity, 10th graders identify 36 different angles and triangles illustrated on the sheet. First, they define the vocabulary to include equilateral, scalene, right, and isosceles triangle. In...
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Lesson Plan
Curated OER

Building With Triangles

For Teachers 3rd - 5th
Students participate in a unit on triangles. Through the unit they explore different way to make basic shapes using triangles. They also examine the basic properties of triangles and the relationships among basic geometrical shapes in...
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Lesson Plan
Curated OER

Triangle Explorer

For Teachers 3rd - 5th
Students calculate the area of triangles using a variety of materials including computer applets.
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Lesson Plan
Curated OER

Triangle Explorer

For Teachers 3rd - 6th
Learners compute the area of triangles in a computer program. In this measurement lesson plan, students complete 5 easy, 5 medium, and 5 hard problems.
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Lesson Plan
Curated OER

Exploring Centers of a Triangle: Part 1

For Teachers 9th - 11th
Learners use problem solving skills, formal geometry, and The Geometer?s Sketchpad. They model and solve two real-world problems by constructing the in center and circumcenter of triangles.
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Worksheet
Curated OER

Types of Triangles

For Students 4th - 5th
In this math worksheet, students classify the listed triangles and practice labeling them correctly. The definition of each type is necessary prerequisite knowledge.
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Lesson Plan
Curated OER

Tricky Triangles

For Teachers 3rd
Third graders engage in a lesson that is concerned with the playing of a Trick Triangle Game while focusing upon developing skills of addition, subtraction, multiplication, and division. They play the game and practice rounding of...
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Lesson Plan
Curated OER

Cabri Jr. - Getting Started with Triangles

For Teachers 9th - 12th Standards
Students explore a basic triangle construction. In this beginning geometry instructional activity, students investigate the steps to necessary to create an equilateral triangle with Cabri Jr.;
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Worksheet
Curated OER

Geometry: Quadrilateral, Triangle, Parallelogram

For Students 3rd - 4th
In this geometry worksheet, learners decide which characteristic, quadrilateral, triangle, or parallelogram make sets of shapes fall under that same category.
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Lesson Plan
Curated OER

Number Triangles

For Teachers 1st - 2nd
In this elementary worksheet, students recognize the number order for the 12 triangles and they cut and glue them in the spaces around the circle.
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Worksheet
Curated OER

Squares and Triangles

For Students K
In this squares and triangles activity, students trace five triangles and six squares, cut out each one and then place them together to make a variety of shapes.
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Interactive
Curated OER

Proofs with Triangles Self-check Practice

For Students 8th - 10th
In this triangle theorems worksheet, students identify the theorem used to prove the specified triangular relationship. Students are shown an illustration of two or more triangles. They identify the postulate that would be used to prove...
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Worksheet
Curated OER

Geometric Shapes: Square, Rectangle, Circle, Triangle

For Students 2nd - 3rd
In this math worksheet, students learn to recognize the square, rectangle, circle and triangle and discover the attributes of each. There are 15 pages available here.
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Unit Plan
Mathematics Vision Project

Geometric Figures

For Teachers 10th - 12th Standards
Logical thinking is at the forefront of this jam-packed lesson, with young mathematicians not only investigating geometric concepts but also how they "know what they know". Through each activity and worksheet, learners wrestle with...
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Activity
1
1
Florida Center for Reading Research

Phonics: Letter-Sound Correspondence, Letter-Sound Pyramid

For Teachers K - 1st Standards
This fun game is a way to help your littlest learners build strong phonological awareness. Scholars equipped with letter triangles, a stack of picture cards, and counters choose a picture card, say the name of the image, and attempt to...
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Lesson Plan
EngageNY

Similarity and the Angle Bisector Theorem

For Teachers 9th - 10th Standards
Identifying and verifying reproducible patterns in mathematics is an essential skill. Mathematicians identify the relationship of sides when an angle is bisected in a triangle. Once the pupils determine the relationship, they prove it to...
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Lesson Plan
EngageNY

Converse of the Pythagorean Theorem

For Students 8th Standards
Discover a new application of the Pythagorean Theorem. Learners prove and apply the converse of the Pythagorean Theorem in the 17th lesson in a 25-part series. The examples ask learners to verify right triangles using the converse of the...
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Worksheet
Curated OER

Two-dimensional Number Patterns

For Students 6th - 7th
In this online two-dimensional number patterns worksheet, students solve eight in-depth two-dimensional number patterns. Students check their answers as they go.
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Lesson Plan
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Maine Content Literacy Project

The Process of Reading vocabulary, literary elements

For Teachers 9th - 12th Standards
Cover Freytag's Triangle and examine Anton Chekhov's "The Bet" in this third lesson plan in a series of fourteen based around short stories. Learners take a quiz and discuss Freytag's triangle. They apply the triangle to "The Bet" and...
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PPT
Curated OER

Triangular arrangements

For Teachers 6th - 12th
Lots of details about arranging flowers in particular shapes will be interesting for students in vocational classes or working towards professional qualifications. There are some pictures to illustrate the different designs, but your...
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Assessment
Concord Consortium

Rectangulating

For Students 9th - 12th Standards
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...
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Worksheet
Curated OER

Hands-On: Sums of Angle Measures

For Students 5th - 8th
In this angle measures worksheet, students solve six word problems where they are given 6 different polygons, some of which are complex, and must determine angle measures in order to arrive at a solution.
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Worksheet
Curated OER

Missing Angle Measures

For Students 5th - 8th
In this missing angle measures worksheet, students subtract the angle that is given from 180' to find the missing angle measure. Students complete 6 problems.

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