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Worksheet
Curated OER

Identify Triangles

For Students 3rd - 5th
In thins triangles review learning exercise, students examine 3 triangles and their measurements. Students classify them as acute, right, obtuse, equilateral, isosceles, or scalene.
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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.
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Worksheet
National Council of Teachers of Mathematics

How Many Triangles?

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

Triangle Problems - Find the Height given the Area

For Students 9th - 12th
In this online math activity, 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!
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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.
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Worksheet
Curated OER

Triangles

For Students 6th - 8th
In this triangle learning exercise, middle schoolers identify triangles according to the characteristics of their sides. Students identify scalene, isosceles, equilateral and right triangles. Eleven triangle problems are provided in...
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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...
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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.
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Worksheet
Curated OER

Identify Triangles

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

Classifying Triangles Worksheet 2

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

Shapes: Triangles

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

Triangle: Print and Color

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

Triangles and Ovals- Ice Cream Cones

For Students K - 1st
In this geometric shapes worksheet, 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.
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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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Worksheet
Curated OER

Perimeter of Equilateral Triangle

For Students 6th - 8th
In this perimeter worksheet, students calculate the perimeter of 6 equilateral triangles.
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Lesson Plan
Curated OER

Triangle Congruence

For Teachers 9th - 11th
Students use web applet to create congruent triangles. In this geometry lesson, students differentiate between congruent and similar. They create shapes online and drag those shapes around to create visuals of triangles.
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Worksheet
Curated OER

Visualize Triangles

For Students 4th - 5th
In this finding triangles in parallelograms learning exercise, students observe parallelograms, visualize half as congruent to triangles, and choose the triangle that would match each one. Students solve 5 problems.
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Lesson Plan
Curated OER

Which Triangles are Right

For Teachers 9th - 10th
Students apply properties of right triangles to solve problems. In this geometry lesson, students identify axioms and theorems using examples.
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Lesson Plan
Curated OER

Special Segments in a Triangle

For Teachers 10th
In this geometry worksheet, 10th graders review the vocabulary associated with the special segments of a triangle and the associated points of concurrency and solve problems in which they find the indicated missing angle or segment.  The...
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Lesson Plan
Curated OER

Investigating Lengths of Segments in a Triangle

For Teachers 9th - 12th Standards
Pupils explore the midsegment of a triangle in the geometry lesson. They draw and measure the segment joining the midpoints of the two sides of a triangle and compare its length to the length of the third side of the triangle. The...
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Worksheet
Curated OER

Constructing Triangles

For Students 5th - 6th
In this constructing triangles online worksheet, students construct thirteen triangles on paper first and then type in their answers on line. Students can check their answers as they go and the computer calculates the overall score for...
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Lesson Plan
Curated OER

Classifying Triangles by the Length of the Sides Using Cabri Jr.

For Teachers 9th - 12th Standards
Learners follow detailed directions to create triangles on their graphing calculator. In this properties of triangles lesson, they will create triangles on their calculators using the Cabri Jr. application. They then identify three...
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Lesson Plan
Curated OER

Roofing and Right Triangles

For Teachers 9th - 11th
Students use models and symbols to represent properties of the Pythagorean Theorem. In this right triangle lesson plan, students connect real jobs to properties of right triangles. They solve word problems applying the correct ratios and...

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