Curated OER
Triangle Explorer
Students calculate the area of triangles using a variety of materials including computer applets.
Curated OER
Triangle Explorer
Students compute the area of triangles in a computer program. In this measurement lesson plan, students complete 5 easy, 5 medium, and 5 hard problems.
Curated OER
Exploring Centers of a Triangle: Part 1
Students 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.
Curated OER
Tricky Triangles
Third graders engage in a instructional activity 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...
Curated OER
Types of Triangles
For this math worksheet, students classify the listed triangles and practice labeling them correctly. The definition of each type is necessary prerequisite knowledge.
Curated OER
Geometry: Quadrilateral, Triangle, Parallelogram
In this geometry worksheet, students decide which characteristic, quadrilateral, triangle, or parallelogram make sets of shapes fall under that same category.
Curated OER
Number Triangles
In this elementary worksheet, pupils recognize the number order for the 12 triangles and they cut and glue them in the spaces around the circle.
Curated OER
Squares and Triangles
In this squares and triangles worksheet, students trace five triangles and six squares, cut out each one and then place them together to make a variety of shapes.
Curated OER
Proofs with Triangles Self-check Practice
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...
Curated OER
Geometric Shapes: Square, Rectangle, Circle, Triangle
In this math learning exercise, students learn to recognize the square, rectangle, circle and triangle and discover the attributes of each. There are 15 pages available here.
Mathematics Vision Project
Geometric Figures
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...
Florida Center for Reading Research
Phonics: Letter-Sound Correspondence, Letter-Sound Pyramid
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...
EngageNY
Similarity and the Angle Bisector Theorem
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...
EngageNY
Converse of the Pythagorean Theorem
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...
Curated OER
Two-dimensional Number Patterns
In this online two-dimensional number patterns worksheet, students solve eight in-depth two-dimensional number patterns. Students check their answers as they go.
Maine Content Literacy Project
The Process of Reading vocabulary, literary elements
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...
Curated OER
Triangular arrangements
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...
Concord Consortium
Rectangulating
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...
Curated OER
Hands-On: Sums of Angle Measures
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.
Curated OER
Missing Angle Measures
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.
Illustrative Mathematics
Area of a Trapezoid
Here is a straightforward example of how to apply the Pythagorean Theorem to find an unknown side-length of a trapezoid. Commentary gives additional information on proving that the inside of the trapezoid is a rectangle, but is...
EngageNY
Putting the Law of Cosines and the Law of Sines to Use
Use the Law of Cosines and the Law of Sines to solve problems using the sums of vectors. Pupils work on several different types of real-world problems that can be modeled using triangles with three known measurements. In the process,...
Teach Engineering
Connect the Dots: Isometric Drawing and Coded Plans
Individuals discover how to draw cubes on triangle-dot paper. They use cubes to build structures and draw corresponding isometric drawings on dot paper in the second lesson of the series of five. The activity also introduces the concept...
Curated OER
Shapes and Tools
Young learners view different shapes drawn by the teacher on the board. The teacher identifies each shape by name and discusses the importance of knowing the difference between shapes when building something. The pupils complete the...
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