subtend
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English[edit]
Etymology[edit]
From Latin subtendere, from sub (“under”) + tendere (“to stretch, extend”). See tend.
Pronunciation[edit]
Verb[edit]
subtend (thirdperson singular simple present subtends, present participle subtending, simple past and past participle subtended)
 (transitive, mathematics) To use an angle to delimit (mark off, enclose) part of a straight or curved line, for example an arc or the opposite side of a triangle.
 A 43° angle subtends an arc of about 0.75 meters on a circle with a radius of 1 meter.
 (transitive, also mathematics) To extend or stretch opposite something; to be part of a straight or curved line that is opposite to and delimits an angle.
 A hypotenuse subtends the right angle of a right triangle.
 An arc measuring about 0.75 meters on a circle with a radius of 1 meter subtends an angle of about 43°.
 2012 August 16, “Me, myself, us”, in The Economist, issue:
 ...trillions of bacteria, each equally an individual, which are found in a person’s gut, his mouth, his scalp, his skin and all of the crevices and orifices that subtend from his body’s surface.
 (transitive, mathematics) To form the central angle of a circle underneath an arc
 The points A and B on the circumference form the arc AB, which subtends the central angle θ.
Translations[edit]
to use an angle to delimit part of a straight or curved line

to extend or stretch opposite something, often to delimit an angle
