What kind of triangle has 2 equal sides

The mean of is given by. Considering the angle at the apex of the triangle and writing instead of , there is a surprisingly simple relationship between the area and vertex angle.

As shown in the above diagram, simple trigonometry gives. Erecting similar isosceles triangles on the edges of an initial triangle gives another triangle such that , , and concur.

The triangles are therefore perspective triangles. No set of points in the plane can determine only isosceles triangles. Gearhart, W. Weisstein, Eric W. Explore thousands of free applications across science, mathematics, engineering, technology, business, art, finance, social sciences, and more. Walk through homework problems step-by-step from beginning to end. Hints help you try the next step on your own. Unlimited random practice problems and answers with built-in Step-by-step solutions.

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MathWorld Book. Wolfram Web Resources ». Created, developed, and nurtured by Eric Weisstein at Wolfram Research. Wolfram Alpha » Explore anything with the first computational knowledge engine. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. If a triangle has 2 sides of equal length, is it isosceles?

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