Curated OER
Same Shape and Size
Can your kindergartners recognize shapes? What about when they are in different orientations? Youngsters study groups of shapes to determine which have the same shape and size. Two of the groups have triangles and ovals, and the other...
Illustrative Mathematics
Alike or Different Game
How are a circle and triangle alike? How are they different? These are the types of questions children will answer while playing this fun geometry game. Including a variety of conventional and unconventional shapes, this activity allows...
University of Wisconsin
Why Did the Triangle Fire Occur?
An investigation of the 1911 New York City Triangle Shirtwaist Factory fire leads class members to examine primary and secondary source materials related to the event and apply what they learn about the working conditions at the time to...
Mathematics Assessment Project
Hopewell Geometry
Right triangles from 2,000 years ago? Learners investigate different right triangles found in the earthworks of the Hopewell people, a Native American culture that populated the United States from 200BC to AD 500. Learners apply concepts...
Curated OER
Triangle Angles
In this math worksheet, learners label the different triangle angles. The worksheet includes four different triangles with various angles.
Curated OER
Triangles
Students discover the difference between triangles. For this triangle lesson plan, students discuss the different types of triangles, then draw the three different types of triangles. The teacher will draw, or model, how to draw the...
Curated OER
Triangles
Students draw triangles. In this shapes lesson, students discuss what they already know about triangles, what they are and what they are made up of. Students discuss the types of triangles and practice drawing each type.
Curated OER
Triangles and Quadrilaterals
In this triangles and quadrilaterals worksheet, 10th graders solve 6 different problems related to using triangles and quadrilaterals in informal geometry. They determine how many lines of symmetry an equilateral triangle and an...
Curated OER
Area of Parallelogram and Triangle
In this geometry learning exercise, 10th graders determine the area of triangles and parallelograms. The one page interactive learning exercise contains ten questions. Answers and hints are included.
Curated OER
Area of Triangle Worksheet
In this area activity, 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.
Curated OER
Building With Triangles
Fourth graders use two different techniques to construct triangles with specific dimensions. They determine how to construct nets for three-dimensional objects focusing on those made with equilateral triangles. They are able to name the...
Curated OER
Triangles
In this triangle worksheet, learners observe pictures of triangles. They name the triangles according to the length of their sides. Twelve right, equilateral and isosceles triangles are provided for identification on this one-page...
Curated OER
Identifying Triangles
In this triangles practice worksheet, learners respond to 4 questions that require them to identify the pictured triangles as acute, right, or obtuse triangles.
Curated OER
Heron's or Hero's Formula for Area of Scalene Triangle
In this Heron's or Hero's formula for area of scalene triangle worksheet, students solve 4 word problems using the formula given for area of a triangle.
Curated OER
Identify Triangles 2
In thins triangles review worksheet, students examine 4 triangles and their measurements. Students classify them as equilateral, isosceles, or scalene.
Curated OER
Identify Triangles
In thins triangles review worksheet, students examine 3 triangles and their measurements. Students classify them as acute, right, obtuse, equilateral, isosceles, or scalene.
Curated OER
Drawing Triangles
In this drawing triangles activity, 6th graders read the dimensions of four triangles, given the length or the angle, identify the type of triangle and draw it.
Curated OER
Triangle Problems - Find the Height given the Area
In this online math worksheet, students find the height of 5 triangles given their area. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching tool!
National Council of Teachers of Mathematics
How Many Triangles?
For this triangles worksheet, learners problem solve and shade triangles within other triangles. Students complete two problems.
Curated OER
Triangle Exploration
Students are introduced to The Geometer's Sketchpad software while in the computer lab. They focus on triangles, horizontal lines, vertex and top parallel lines. Each student utilizes geometry to complete basic geometric constructions.
Curated OER
Triangles
In this triangle worksheet, students identify triangles according to the characteristics of their sides. Students identify scalene, isosceles, equilateral and right triangles. Eleven triangle problems are provided in this one-page...
Curated OER
Angles in a Triangle
In this online math worksheet, 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 terrific...
Curated OER
Drawing a Triangle with Cabri Junior
Learners draw triangles on their graphing calculators using the Cabri Junior application. For this graphing calculator lesson, students follow step by step directions to create triangles on their calculator. They identify the type of...
Curated OER
Triangle in the Matrix
Young mathematicians represent a triangle with a matrix and use the determinant to find the area of three given triangles. Learners also verify the formula for area of a triangle.
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