Right Triangles

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by hbritland
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Right Triangles

A right triangle is a triangle that has a 90 degree angle.

Overview:- Definition of a right triagle- Types of right triangles-Pythagorean theorem-Sides of triangle

Geometry 2.1Right Triangles

Pythagorean theoryIn a right angled triangle, the square of the hypotenuse(side c) is equal to the sum of the squares of the other two sides.a^2 + b^2 = c^2Why Is This Useful?If we know the lengths of two sides of a right angled triangle, we can find the length of the third side.

Example: using the Pythagorean theorma^2 + b^2 = c^29^2 + b^2 = 15^281 + b^2 = 225Take 81 from both sides:b^2 = 144b = √144b = 12

Also known as a Scalene right triangle

Sides of a Triangle

or 45-45-90 trianlge



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