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The 6 edge lengths - associated to the six edges of the tetrahedron. The 12 face angles - there are three of them for each of the four faces of the tetrahedron. The 6 dihedral angles - associated to the six edges of the tetrahedron, since any two faces of the tetrahedron are connected by an edge.
An angle bisector of a triangle is a straight line through a vertex that cuts the corresponding angle in half. The three angle bisectors intersect in a single point, the incenter, which is the center of the triangle's incircle. The incircle is the circle that lies inside the triangle and touches all three sides. Its radius is called the inradius.
V(4.6. 4 / 3 .6) π − π / 3 120° Octahemioctacron (Dual of octahemioctahedron) — V(3.6. 3 / 2 .6) π − π / 3 120° Small dodecahemidodecacron (Dual of small dodecahemidodecacron) — V(5.10. 5 / 4 .10) π − π / 5 144° Small icosihemidodecacron (Dual of small icosihemidodecacron) — V(3. ...
Case 1: three sides given (SSS). The cosine rule may be used to give the angles A, B, and C but, to avoid ambiguities, the half angle formulae are preferred. Case 2: two sides and an included angle given (SAS). The cosine rule gives a and then we are back to Case 1. Case 3: two sides and an opposite angle given (SSA).
The three faces interior to the ... If the "clockwise" sides of three of them are multiplied and the product is ... Three angles are the angles of some triangle if ...
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In general, the measures of the interior angles of a simple convex polygon with n sides add up to (n − 2) π radians, or (n − 2)180 degrees, (n − 2)2 right angles, or (n − 2) 1 / 2 turn. The supplement of an interior angle is called an exterior angle; that is, an interior angle and an exterior angle form a linear pair of angles ...
The only triangles with one angle being twice another and having integer sides in arithmetic progression are acute: namely, the (4,5,6) triangle and its multiples. [ 6 ] There are no acute integer-sided triangles with area = perimeter , but there are three obtuse ones, having sides [ 7 ] (6,25,29), (7,15,20), and (9,10,17).