Isosceles Triangle Teacher Resources
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Pythagoras Rectangles and Isosceles Triangles
6 mins 7th - 12th CCSS: Adaptable
New ReviewWhen does the Pythagorean Theorem come in handy? An intriguing video uses the Pythagorean Theorem to solve problems other than simply finding the length of a side of a right triangle. Pupils find the diagonal of a rectangle and the...
Base Angles of Isosceles Triangles
9th - 10th CCSS: Designed
Build confidence in proofs by proving a known property. Pupils explore two approaches to proving base angles of isosceles triangles are congruent: transformations and SAS. They then apply their understanding of the proof to more complex...
Isosceles Triangles and Special Line Segments
9th - 12th CCSS: Adaptable
Under which conditions can a triangle be classified as isosceles? High schoolers practice identifying isosceles triangles and special line segments, including angle bisectors, medians of triangles, and perpendicular bisectors of sides of...
The Isosceles Triangle Theorem is Actually Really Simple!
7 mins 9th - 12th CCSS: Adaptable
The isosceles triangle comes with its own set of properties. A lecturer shows how to apply the Isosceles Triangle Theorem to find missing side lengths or angle measures. The final example involves both square roots and quadratic equations.
How Do You Find Missing Angles in an Isosceles Triangle?
4 mins 6th - 8th
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...
How Do You Find Missing Angles in an Isosceles Triangle Using Right Triangles?
4 mins 6th - 8th
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...
Reflections and Isosceles Triangles
9th - 11th CCSS: Designed
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...
What are Equilateral, Isosceles, and Scalene Triangles?
6 mins 5th - 8th
Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...
Accelerated Geometry Review Sheet
8th - 10th CCSS: Adaptable
Your geometry learners use their knowledge of various geometric concepts to write proofs. Starting with givens containing parallel line segments with transversals and triangles and quadrilaterals, and the mid-point and distance formulas;...
Lengths of Sides in Isosceles Right Triangles: Paper Football
9th - 12th CCSS: Designed
Fuse sports and geometry by having your class create paper footballs—that are actually isosceles right triangles! Scholars use an interactive to create an isosceles right triangle to model a paper football. From the information in the...
Equilateral Triangles: Lesson
3 mins 8th - 11th CCSS: Adaptable
Take a second look at triangles that are equal all the way around. The video reminds viewers what an equilateral triangle is and points out that the three angles are the same. Using the fact that equilateral triangles are also isosceles,...
Special Triangle Ratios: Special Right Triangle Ratios
9th - 12th CCSS: Designed
Go from one side length to any other side length with special right triangles. Individuals use the interactive to investigate the ratio of sides in 45-45 and 30-60 right triangles. Scholars make generalizations about the types of special...
Assessment For The California Mathematics Standards Grade 4
4th CCSS: Adaptable
Have scholars show what they know with a 20-page assessment aligned to the California State Standards. The test covers concepts such as large and whole numbers, all four mathematical operations, fractions, decimals, geometric figures,...
Inscribed Angles of Circles
9 mins 9th - 12th CCSS: Adaptable
Relationships in circles build from the many connections made throughout the geometry course. The instructor in the video explains these connections as she builds the concept of inscribed angles. Using examples, the narrator highlights...
Construct a 45 Degree Angle
2 mins 8th - 11th CCSS: Adaptable
New ReviewCreate a 45-degree angle without bisecting an angle. A video shows a method to construct a 45-degree angle without needing to bisect a right angle. By constructing an isosceles right triangle, the presenter constructs a 45-degree angle...
Constructions of Isosceles and Equilateral Triangles
4th - 9th
Students explore the difference between drawing and constructing a triangle utilizing The Geometer's Sketchpad on the computer. They create, develop and script constructions for both isosceles and equilateral triangles. Each student has...