Acute triangle definition  Math Open Reference
In any triangle, two of the interior angles are always acute (less than 90 degrees) *, so there are three possibilities for the third angle: . Less than 90°  all three angles are acute and so the triangle is acute. Exactly 90°  it is a right triangle Greater than 90° (obtuse): the triangle is an obtuse triangle In the figure above, drag the vertices around and try to create all 3 ...
Triangle Classification
Triangle Classification. The basic elements of any triangle are its sides and angles.Triangles are classified depending on relative sizes of their elements. As regard their sides, triangles may be
Geometric Probability  CuttheKnot
Geometric Probability. Random events that take place in continuous sample space may invoke geometric imagery for at least two reasons: due to the nature of the problem or due the the nature of the solution.. Some problems, like Buffon's needle, Birds On a Wire, Bertrand's Paradox, or the problem of the Stick Broken Into Three Pieces do, by their nature, arise in a geometric setting.
Triangle Circumcenter definition  Math Open Reference
One of several centers the triangle can have, the circumcenter is the point where the perpendicular bisectors of a triangle intersect. The circumcenter is also the center of the triangle's circumcircle  the circle that passes through all three of the triangle's vertices.As you reshape the triangle above, notice that the circumcenter may lie outside the triangle.
Triangle Types and Classifications: Isosceles, Equilateral ...
Triangles can be classified by various properties relating to their angles and sides. The most common classifications are described on this page.
Scalene Triangle  from Wolfram MathWorld
A scalene triangle is a triangle that has three unequal sides, such as those illustrated above.
Figures and Polygons  Math League
Regular Polygon. A regular polygon is a polygon whose sides are all the same length, and whose angles are all the same. The sum of the angles of a polygon with n sides, where n is 3 or more, is 180° × (n 2) degrees.. Examples:
Online Triangle Calculator. Enter any valid values and ...
Your 3 side lengths are invalid.Side Lengths of do not adhere to the triangle inequality theorem .Which states that the sum of the side lengths of any 2 sides of a triangle must exceed the length of the third side. Read more about this rule here .
Triangle  Wikipedia
A triangle is a polygon with three edges and three vertices.It is one of the basic shapes in geometry.A triangle with vertices A, B, and C is denoted .. In Euclidean geometry any three points, when noncollinear, determine a unique triangle and simultaneously, a unique plane (i.e. a twodimensional Euclidean space).In other words, there is only one plane that contains that triangle, and every ...
Isosceles Triangle  from Wolfram MathWorld
Isosceles Triangle. An isosceles triangle is a triangle with (at least) two equal sides. In the figure above, the two equal sides have length and the remaining side has length .This property is equivalent to two angles of the triangle being equal.
