to subtend an angle

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• subtend — [səb tend′] vt. [L subtendere < sub , under + tendere, to stretch: see TEND2] 1. to extend under or be opposite to in position [each side of a triangle subtends the opposite angle] 2. Bot. to enclose in an angle, as between a leaf and its stem …   English World dictionary

• Subtend — Sub*tend , v. t. [imp. & p. p. {Subtended}; p. pr. & vb. n. {Subtending}.] [L. subtendere; sub under + tendere to stretch, extend. See {Tend}.] To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the… …   The Collaborative International Dictionary of English

• subtend — ► VERB ▪ (of a line, arc, etc.) form (an angle) at a particular point when straight lines from its extremities meet. ORIGIN Latin subtendere, from tendere stretch …   English terms dictionary

• subtend — transitive verb Etymology: Latin subtendere to stretch beneath, from sub + tendere to stretch more at thin Date: 1570 1. a. to be opposite to and extend from one side to the other of < a hypotenuse subtends a right angle > b. to fix the angular… …   New Collegiate Dictionary

• subtend — verb /sʌbˈtɛnd/ a) To extend or stretch underneath or opposite something A 90° angle subtends an arc about ¾ meter long on a circle with a radius of 1 meter. b) To enclose an arc on a circle with an …   Wiktionary

• subtend — [sʌb tɛnd] verb 1》 Geometry (of a line, arc, etc.) form (an angle) at a particular point when straight lines from its extremities meet.     ↘(of an angle or chord) have bounding lines or points that meet or coincide with those of (a line or arc) …   English new terms dictionary

• subtend — v.tr. 1 a (usu. foll. by at) (of a line, arc, figure, etc.) form (an angle) at a particular point when its extremities are joined at that point. b (of an angle or chord) have bounding lines or points that meet or coincide with those of (a line or …   Useful english dictionary

• subtend — verb (T) technical to be opposite to a particular angle or arc, and form the limits of it in geometry …   Longman dictionary of contemporary English

• Visual Angle Illusion — The visual angle, V degrees, subtended by a viewed object sometimes looks larger or smaller than its actual value, creating a visual angle illusion (V illusion).These V illusions have been explicitly described by many vision researchers,… …   Wikipedia

• Solid angle — The solid angle, Ω , is the angle in three dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point. For instance, a small object nearby could subtend the same… …   Wikipedia

• Visual angle — The 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 sketch helps to define it 1,2It shows an observer s eye looking at a frontal extent (the vertical …   Wikipedia