#triangle
7 concepts
Concepts
Triangle
A polygon with three sides. The sum of interior angles is always 180°.
Pythagorean Theorem
In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.
Area of Triangle
The area of a triangle is half the product of its base and height.
Similar Triangles
Two triangles are similar if their corresponding angles are equal and their corresponding sides are proportional.
Congruent Triangles
Two triangles are congruent if they have exactly the same shape and size. All corresponding sides and angles are equal.
Law of Sines
The Law of Sines states that the ratio of each side length to the sine of its opposite angle is constant in a triangle.
Law of Cosines
The Law of Cosines relates one side of a triangle to the other two sides and their included angle. It generalizes the Pythagorean theorem.