Isosceles Triangle Teacher Resources

Find Isosceles Triangle educational ideas and activities

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Show your school spirit while proving theorems about triangles! Your student geometers are charged with coming up with a new design for the school pennant, following specific guidelines. Along the way, they need to prove the theorem that base angles of an isosceles triangle are congruent. Not only is this a learning activity, if you allow time to decorate the pennants, you'll end up with great room or hall decorations. 
Seventh graders recognize the characteristics of isosceles triangles. In this isosceles triangle lesson, 7th graders use geoboards to create isosceles triangles. Students record results and explain why they have an isosceles triangle.
Your young designers use geometric concepts and isosceles triangle properties to create a blue print for a pennant with specific criteria. Second, they write a geometric proof outlining the correlation between base angle measures and the side measures of their pennant. Finally, follow-up questions guide your pennant designers in a discussion about the geometry used in this math task.
Fifth graders solve problems while examining a variety of isosceles triangles.  In this isosceles triangle lesson, 5th graders examine shapes to find their characteristics.  Students pay particular attention to the characteristics of isosceles triangles and solve problems related to them.
In this isosceles triangle worksheet, young scholars solve 19 multiple choice and short answer problems.  Students use the isosceles triangle theorem to determine unknown angle measures.
Students identify the properties of an isosceles triangle. In this geometry lesson, students find the midpoint, median and angle bisector of a triangle. They construct angle bisectors and measure missing angles.
In this geometry worksheet, students differentiate between regular triangles and isosceles triangles. They apply the converse theorem and the vertex angle. There are eleven questions with an answer key.
Finding the missing values of two angles in an isosceles triangle is not as difficult as it sounds. But how can two out of three angle's measurements be found? Well, there are special properties about an isosceles triangle which make this problem solvable. Watch this video as the instructor explains the triangle sum theorem and how it applies to an isosceles triangle.
Given an isosceles triangle, and the value of one angle, find the missing values. There are some special properties about isosceles triangles. Use the triangle sum theorem to solve this problem. Watch this video to see how the instructor sorts it all out step-by-step as she demonstrates how to use the special properties as related to a right triangle.
In this isosceles triangle activity, students find the missing side of five isosceles triangles from the given information.  The solutions are provided.
Geometers explore symmetries of isosceles triangles by using rigid transformations of the plane. They complete four tasks, including congruence proofs, which illustrate the relationship between congruence and rigid transformations. The activity requires a thorough understanding of the definition of reflection about a line and is better suited for more sophisticated geometry students.
Students explore the concept of triangles.  In this triangles lesson, students prove and apply the Isosceles Triangle Theorem using Cabri Jr. on the graphing calculator.  Students construct triangles and measure the angles.  Students drag the points of the triangle to notice the relationship in angle measure.  Students construct an isosceles triangle and develop the idea that isosceles triangles have two equal sides and two congruent angles.
Students explore the concept of triangles. In this triangles lesson, students use Geometer's Sketchpad to explore characteristics of isosceles triangles and right triangle trigonometric ratios. Students measure lengths of sides and angle degrees.
Students construct triangles using Cabri Jr.  In this constructing triangles using Cabri Jr. instructional activity, students construct isosceles triangles.  Students use two radii of a circle to construct an isosceles triangle.  Students measure the angles of their triangle construction and make conjectures about isosceles triangles.
In this geometry activity, 10th graders explore triangle properties, including the sum of the measures of the angles of a triangle, the triangle inequalities, properties of isosceles triangles, properties of congruent triangles, and flowchart proofs.  The eight page activity contains seventy-six problems.  Answers are not provided. 
In this isosceles triangles worksheet, students justify and determine the symmetry of an isosceles triangle. They explore the bisector of rectangles. This three-page worksheet contains two problems. Answers are listed on page three.
Students investigate triangles. In this shapes geometry lesson, students define and state the attributes for equilateral, scalene, and isosceles triangles. Students locate the prefix "tri" in a variety of words and make connections with the relationship to "three." Students cut out and arrange triangles to make a picture.
In this isosceles triangle worksheet, students use theorems to determine if given triangles are congruent or not congruent. In addition, they identify the described triangles as isosceles or right. This one-page worksheet contains ten problems.
In this geometry instructional activity, 10th graders solve a problem involving an isosceles triangle.  The problem appears to be deceptively easy, but instead requires the use of trigonometry to arrive at a correct solution.  The one page instructional activity contains one problem with solution. 
Students study geometry. In this isosceles triangles lesson, students use the software Geometer's Sketch Pad to explore the properties of this type of triangle. They work independently at a computer to complete various activities.

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