Isosceles Triangle Teacher Resources
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Pythagoras Rectangles and Isosceles Triangles
6 mins 7th - 12th CCSS: Adaptable
When 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...