Use the following formula also derived from the Pythagorean theorem to solve the length of side a: The base length b is equal to 2 times the square root of quantity leg a squared minus the height h squared. Use the following formula derived from the Pythagorean theorem to solve the length of the base side: Given the height, or altitude, of an isosceles triangle and the length of one of the sides or the base, it’s possible to calculate the length of the other sides.
HYPOTENUSE OF ISOSCELES RIGHT TRIANGLE HOW TO
How to Calculate Edge Lengths of an Isosceles Triangle We have a special right triangle calculator to calculate this type of triangle.
Note, this means that any reference made to side length a applies to either of the identical side lengths as they are equal, and any reference made to base angle α applies to either of the base angles as they are also identical. When references are made to the angles of a triangle, they are most commonly referring to the interior angles.īecause the side lengths opposite the base angles are of equal length, the base angles are also identical. The two interior angles adjacent to the base are called the base angles, while the interior angle opposite the base is called the vertex angle. The equilateral triangle, for example, is considered a special case of the isosceles triangle. However, sometimes they are referred to as having at least two sides of equal length. Isosceles triangles are typically considered to have exactly two sides of equal length. The third side is often referred to as the base. An isosceles triangle is a triangle that has two sides of equal length.
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