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9.7 Special Right Triangles (Practice)

9.7 Special Right Triangles (Lesson)

By AutenMath

A review of practice problems using knowledge of special right triangles (30, 60, 90) and (45, 45, 90)

Special Right Triangles in Geometry: 45-45-90 and 30-60-90

Special Right Triangles in Geometry: 45-45-90 and 30-60-90 degree triangles. In this video, I discuss two special right triangles, how to derive the formulas to find the lengths of the sides of the triangles by knowing the length of one side, and then do a few examples using them!

Special right triangles

By Khan Academy

Showing the ratios of the sides of a 45-45-90 triangle are 1:1:sqrt(2)

Special right triangles

By Khan Academy

A few more 45-45-90 examples and an introduction to 30-60-90 triangles.

Special right triangles

By Khan Academy

Using what we know about 30-60-90 triangles to solve what at first seems to be a challenging problem

Special right triangles

By Khan Academy

Introduction to 45-45-90 Triangles

Recognizing triangle types

By Khan Academy

Scalene, isosceles, equilateral, acute, right, obtuse. All are types of triangles but what makes them special depends on the method of categorization. Watch this outstanding explanation.

45-45-90 triangles | Right triangles and trigonometry | Geometry | Khan Academy

By Khan Academy

Video uses an electronic black board with different colored pens. Introduction to 45-45-90 Triangles, these can also be called right triangles because of the 90 degree measurement. These triangles are special because if two angles of a triangle are equal the one side they don’t share is going to be equal. This then goes on to explain Pythagorean Theorem, Side A squared + Side B squared = Side C squared, side C is the hypotenuse or the side that is shared in a triangle. The narrator goes on to explain how to solve, using square roots. This video is for middle school students.