Curated OER
Perimeter of Equilateral Triangle
In this perimeter learning exercise, students calculate the perimeter of 6 equilateral triangles.
Curated OER
Triangle Congruence
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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Visualize Triangles
In this finding triangles in parallelograms activity, 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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Which Triangles are Right
Students apply properties of right triangles to solve problems. In this geometry lesson, students identify axioms and theorems using examples.
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Special Segments in a Triangle
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...
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Constructing Triangles
In this constructing triangles online instructional activity, 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...
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Roofing and Right Triangles
Learners use models and symbols to represent properties of the Pythagorean Theorem. In this right triangle lesson, students connect real jobs to properties of right triangles. They solve word problems applying the correct ratios and...
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The Triangles Problem
For this geometry worksheet, 10th graders explain how two triangles can have 5 parts of the other triangle and still not be congruent. This is a word problem with an answer key.
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Applications of Triangles
Students apply the properties of a right triangle. In this triangle lesson, students describe and compare radians to degrees. They solve problems using the properties and ratios of a right triangle.
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Indirect Proof and Inequalities in One Triangle
In this geometry worksheet, 10th graders order the sides and angles of a triangle and determine the range of the third side of a triangle given the lengths of two sides. The one page worksheet contains sixteen questions. ...
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Triangle Fundamentals Multiple Choice
In this triangle fundamentals worksheet, learners identify possible side lengths of triangles. The first three problems give measurements of the sides, students select the combination that is possible in a triangle. The final three...
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Self-Check for Triangle Congruence Proofs Multiple Choice
In this triangle congruence worksheet, students select the postulate that is being illustrated to prove congruence between triangles. The worksheet is self-scoring. Once students select the "check your work" link, they are given their...
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Congruent Triangles
Students identify properties of triangles. In this geometry lesson, students differentiate between similar and congruent triangles. They use the umber of sides to help define the angle of the polygon.
National First Ladies' Library
Fire! The Triangle Shirtwaist Factory Trial and It's Aftermath
Middle schoolers research, examine and are provided the opportunity to re-enact one of the most exciting trials of the 20th century, The Triangle Shirtwaist Factory Trial. They research the history of the trial and then divide into...
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Medians and Altitudes of Triangles
In this geometry worksheet, 10th graders determine if a given segment is a median or altitude of a triangle and use then find the indicated missing length or equation of a line. The two page worksheet contains twenty...
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Congruent Triangles
In this congruent triangles worksheet, 10th graders solve and complete 16 different types of problems. First, they name the corresponding parts of the congruent triangles shown and draw a picture. Then, students list the five ways to...
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Triangle Shirtwaist Fire Tragedy
Young scholars research the Triangle Shirtwaist Fire. In this labor reform lesson, students research the fire and write a newspaper article report from the perspective of the time. Young scholars evaluate the perspective of the workers...
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Triangle Trigonometry IB Packet
In this trigonometry worksheet, students use triangle trignometry to solve problems in order to find the missing length, angle, or area of the triangle. The one page worksheet contains five ...
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Triangle Fire and Labor Movement
Tenth graders, in groups, explore the garment industry before, during, and after the Triangle Shirtwaist Fire to learn about the Labor Movement, unions, and some of the people who impacted working conditions for both adults and children...
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Using Triangles To Make Shapes
For this using triangles worksheet, learners create quadrilaterals and hexagons. In this problem solving worksheet, students draw as many quadrilaterals and hexagons as possible.
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The Triangle Midsegment Theorem
In this geometry instructional activity, 10th graders identify the vocabulary associated with the Triangle Midsegment Theorem and solve problems in which they find the size of a missing angle or segment. The one page instructional...
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Identifying Triangles
In this triangles practice instructional activity, students respond to 4 questions that require them to identify the pictured triangles as acute, right, obtuse, scalene, isosceles, or equilateral triangles.
Curated OER
Equilateral Triangles
In this equilateral triangles worksheet, students study the various triangles to identify equilateral triangles. Students may count the triangles.
Math Salamanders Ltd.
2D Shape Sheet Isosceles Triangles
In this isosceles triangle worksheet, students cut or count the triangles on this sheet. Students cut or count out 13 isosceles triangles that are all different colors.
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