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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 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 non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. a two-dimensional 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.
Classifying triangles (video) | Shapes | Khan Academy
Learn to categorize triangles as scalene, isosceles, equilateral, acute, right, or obtuse.
Geometry Tutoring, Tutorial, Tutor
Geometry from the Land of the Incas: College, High School, Theorems and Problems. Tutoring, Tutorial, Tutor
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.
List of triangle inequalities - Wikipedia
For the basic inequality a < b + c, see Triangle inequality. For inequalities of acute or obtuse triangles, see Acute and obtuse triangles.. In geometry, triangle inequalities are inequalities involving the parameters of triangles, that hold for every triangle, or for every triangle meeting certain conditions.The inequalities give an ordering of two different values: they are of the form "less ...