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The cotangent, or four-part, formulae relate two sides and two angles forming four consecutive parts around the triangle, for example (aCbA) or BaCb). In such a set there are inner and outer parts: for example in the set ( BaCb ) the inner angle is C , the inner side is a , the outer angle is B , the outer side is b .
The diagonal of a square bisects its internal angle, forming adjacent angles of 45°. All four sides of a square are equal. Opposite sides of a square are parallel. A square has Schläfli symbol {4}. A truncated square, t{4}, is an octagon, {8}. An alternated square, h{4}, is a digon, {2}. The square is the n = 2 case of the families of n ...
In spherical geometry, a spherical quadrilateral formed from four intersecting greater circles is cyclic if and only if the summations of the opposite angles are equal, i.e., α + γ = β + δ for consecutive angles α, β, γ, δ of the quadrilateral. [30] One direction of this theorem was proved by Anders Johan Lexell in 1782. [31]
When an equidiagonal kite has side lengths less than or equal to its diagonals, like this one or the square, it is one of the quadrilaterals with the greatest ratio of area to diameter. [21] A kite with three 108° angles and one 36° angle forms the convex hull of the lute of Pythagoras, a fractal made of nested pentagrams. [22]
Consecutive interior angles are the two pairs of angles that: [4] [2] have distinct vertex points, lie on the same side of the transversal and; are both interior. Two lines are parallel if and only if the two angles of any pair of consecutive interior angles of any transversal are supplementary (sum to 180°).
Fold a square sheet of paper in half, creating a falling diagonal crease (bisect 90° angle), then unfold. Fold the right hand edge onto the diagonal crease (bisect 45° angle). Fold the top edge in half, to the back side (reduce width by 1 / σ + 1 ), and open out the triangle. The result is a √2 rectangle.
As discussed in § Constructibility, only certain angles that are rational multiples of radians have trigonometric values that can be expressed with square roots. The angle 1°, being / = / radians, has a repeated factor of 3 in the denominator and therefore cannot be expressed using only square roots. A related question is whether it can ...
The square of each internal angle bisector of an integer triangle is rational, because the general triangle formula for the internal angle bisector of angle A is () / (+) where s is the semiperimeter (and likewise for the other angles' bisectors).
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