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Visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc. It also is called the object's angular size . The diagram on the right shows an observer's eye looking at a frontal extent (the vertical arrow) that has a linear size S {\displaystyle S} , located in the distance D {\displaystyle D} from point O ...
Angular diameter: the angle subtended by an object The angular diameter , angular size , apparent diameter , or apparent size is an angular separation (in units of angle ) describing how large a sphere or circle appears from a given point of view.
The straight lines which form right angles are called perpendicular. [8] Euclid uses right angles in definitions 11 and 12 to define acute angles (those smaller than a right angle) and obtuse angles (those greater than a right angle). [9] Two angles are called complementary if their sum is a right angle. [10]
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Juggling – Physical skill, performed by a juggler, involving the manipulation of objects for recreation, entertainment, art or sport. Jump rope – Tool used in the sport of skipping/jump rope where one or more participants jump over a rope swung so that it passes under their feet and over their heads.
For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes . Generally composed of straight line segments
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. [ 1 ] [ 2 ] In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.