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 ...
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.
Scalene Triangle  from Wolfram MathWorld
A scalene triangle is a triangle that has three unequal sides, such as those illustrated above.
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
An isosceles triangle is a triangle with (at least) two equal sides. In the figure above, the two equal sides have length b and the remaining side has length a. This property is equivalent to two angles of the triangle being equal. An isosceles triangle therefore has both two equal sides and two equal angles. The name derives from the Greek iso (same) and skelos (leg).
Math.com Glossary
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Classifying triangles (video)  Shapes  Khan Academy
What I want to do in this video is talk about the two main ways that triangles are categorized. The first way is based on whether or not the triangle has equal sides, or at least a few equal sides.
Geometry Tutoring, Tutorial, Tutor
Visual Geometry Index. Geometry Online, Tutoring, Tutorial, Tutor. Math Education, College, High school, Help, Elearning, Tutor, Interactive Software, iPad apps ...
Mathwords: Index for Geometry
Index for Geometry Math terminology from plane and solid geometry. This includes basic triangle trigonometry as well as a few facts not traditionally taught in basic geometry.
