Worksheet
Curated OER

Triangles and Quadrilaterals

For Students 10th
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...
Interactive
Curated OER

Area of Parallelogram and Triangle

For Students 10th
In this geometry instructional activity, 10th graders determine the area of triangles and parallelograms. The one page interactive instructional activity contains ten questions. Answers and hints are included. 
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. 
Worksheet
Curated OER

Triangles

For Students 6th - 7th
In this triangle worksheet, students 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...
Worksheet
Curated OER

Identifying Triangles

For Students 5th - 7th
In this triangles practice learning exercise, learners respond to 4 questions that require them to identify the pictured triangles as acute, right, or obtuse triangles.
Worksheet
Curated OER

Heron's or Hero's Formula for Area of Scalene Triangle

For Students 7th - 8th
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.
Worksheet
Curated OER

Identify Triangles 2

For Students 2nd - 5th
In thins triangles review worksheet, students examine 4 triangles and their measurements. Students classify them as equilateral, isosceles, or scalene.
Worksheet
Curated OER

Identify Triangles

For Students 3rd - 5th
In thins triangles review worksheet, students examine 3 triangles and their measurements. Students classify them as acute, right, obtuse, equilateral, isosceles, or scalene.
Worksheet
Curated OER

Drawing Triangles

For Students 6th
In this drawing triangles worksheet, 6th graders read the dimensions of four triangles, given the length or the angle, identify the type of triangle and draw it.
Worksheet
National Council of Teachers of Mathematics

How Many Triangles?

For Students 5th - 8th
For this triangles worksheet, learners problem solve and shade triangles within other triangles. Learners complete two problems.
Interactive
Curated OER

Triangle Problems - Find the Height given the Area

For Students 9th - 12th
In this online math worksheet, learners 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!
Lesson Plan
Curated OER

Triangle Exploration

For Teachers 6th - 12th
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.
Lesson Plan
Curated OER

Drawing a Triangle with Cabri Junior

For Teachers 9th - 12th Standards
Learners draw triangles on their graphing calculators using the Cabri Junior application. In this graphing calculator lesson, students follow step by step directions to create triangles on their calculator. They identify the type of...
Worksheet
Curated OER

Triangles

For Students 6th - 8th
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...
Lesson Plan
Curated OER

Triangle in the Matrix

For Teachers 9th - 12th Standards
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. 
Interactive
Curated OER

Angles in a Triangle

For Students 9th - 12th
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...
Printables
Curated OER

Toby the Turtle and His Triangle

For Teachers Pre-K - K
In this triangles worksheet, students trace two dotted examples of triangles and then draw their own. Students analyze a row of geometric shapes and color the triangles.
Worksheet
Curated OER

Identify Triangles

For Students 3rd - 6th
For this triangles worksheet, students identify each triangle as either being equilateral, isosceles, or scalene. Students complete answers for 3 triangles.
Worksheet
Curated OER

Classifying Triangles Worksheet 2

For Students 4th - 8th
In this classifying triangles instructional activity, learners classify triangles as either scalene, isosceles, or equilateral. Students complete 9 problems.
Worksheet
Curated OER

Shapes: Triangles

For Students Pre-K - 1st
In this learning shapes worksheet, students practice their fine motor skills as they trace the triangle shape and trace the word "triangle."
Worksheet
Curated OER

Triangle: Print and Color

For Students Pre-K - 1st
In this word recognition learning exercise, students trace the word "triangle", write the word independently, and color the picture of the triangle.
Worksheet
Curated OER

Triangles and Rectangles

For Students K - 1st
In this geometric shapes worksheet, students study five pictures of trees made out of triangles and rectangles. Students follow the directions to trace and color the shapes they find in the picture.
Worksheet
Curated OER

Triangles and Ovals- Ice Cream Cones

For Students K - 1st
In this geometric shapes activity, students look for ovals and triangles in a picture of three multi-scoop ice cream cones. Students follow the directions to color each shape they find.
Worksheet
Curated OER

Find the unknown angle in the following triangles

For Students 4th - 7th
In this unknown angle worksheet, students find the unknown angle in the triangle that gives them 2 angles. Students find 9 unknown angles.

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