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2. Spat (angular unit) - Wikipedia

   en.wikipedia.org/wiki/Spat_(angular_unit)

   Spat (angular unit) The spat (symbol sp [1] ), from the Latin spatium ("space"), is a unit of solid angle. [2] [3] 1 spat is equal to 4 π steradians [1] [3] or approximately 41 253 square degrees of solid angle (sequence A125560 in the OEIS ). [2] Thus it is the solid angle subtended by a complete sphere at its center.

3. Orientation (geometry) - Wikipedia

   en.wikipedia.org/wiki/Orientation_(geometry)

   Orientation (geometry) Changing orientation of a rigid body is the same as rotating the axes of a reference frame attached to it. In geometry, the orientation, attitude, bearing, direction, or angular position of an object – such as a line, plane or rigid body – is part of the description of how it is placed in the space it occupies. [1]

4. Congruence (geometry) - Wikipedia

   en.wikipedia.org/wiki/Congruence_(geometry)

   Definition of congruence in analytic geometry. In a Euclidean system, congruence is fundamental; it is the counterpart of equality for numbers. In analytic geometry, congruence may be defined intuitively thus: two mappings of figures onto one Cartesian coordinate system are congruent if and only if, for any two points in the first mapping, the ...

5. Trigonometry - Wikipedia

   en.wikipedia.org/wiki/Trigonometry

   Trigonometry. Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle', and μέτρον (métron) 'measure') [1] is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths.

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7. Dash - Wikipedia

   en.wikipedia.org/wiki/Dash

   The dash is a punctuation mark consisting of a long horizontal line. It is similar in appearance to the hyphen but is longer and sometimes higher from the baseline.The most common versions are the en dash –, generally longer than the hyphen but shorter than the minus sign; the em dash —, longer than either the en dash or the minus sign; and the horizontal bar ―, whose length varies ...