What is an isosceles triangle? Learn the isosceles triangle definition, the properties of isosceles triangles, and view examples of isosceles triangles.

Learn how to prove congruent isosceles triangles step by step in this video lesson. Watch now to enhance your geometry skills with clear examples, followed by a quiz!

Learn to define what an isosceles trapezoid is. Examine the properties of an isosceles trapezoid, and see how to find an isosceles trapezoid's area and perimeter.

Learn how to find the area of an isosceles triangle. Discover the isosceles triangle formula and use it to calculate unknown side lengths of an isosceles triangle.

Learn how to identify scalene, isosceles, and equilateral triangles from coordinates, and see examples that walk through sample problems step-by-step for you to improve your math …

Learn how to solve for values in an isosceles triangle using the Pythagorean theorem, and see examples that walk through sample problems step-by-step for you to improve your math …

Learn what a vertex angle of an isosceles triangle is with our 5-minute video lesson! View clear examples and test your knowledge with a quiz for practice.

Learn how to find angle measures of an isosceles triangle given angles with variables, and see examples that walk through sample problems step-by-step for you to improve your math …

Learn about isosceles trapezoid angles and proofs. Work through the isosceles trapezoid theorem and learn proofs related to the interior angles of a trapezoid.

Discover the classifications of triangles and learn how to classify triangles by sides and angles. Explore the properties of scalene, isosceles, equilateral, acute, obtuse, and right triangles.