subtend
vt. 对
发音
词形变化
释义与例句
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1.
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.
及物 数学A 43° angle subtends an arc of about 0.75 meters on a circle with a radius of 1 meter.
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2.
To extend or stretch opposite something; to be part of a straight or curved line that is opposite to and delimits an angle.
及物 数学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°.
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3.
To form the central angle of a circle underneath an arc.
及物 数学The points A and B on the circumference form the arc AB, which subtends the central angle θ.
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4.
To stand beneath or close to, as a bract at the base of a flower.
及物 生物 植物学
词汇关系
同义词 1
上位词 2
词源
From Latin subtendere, from sub (“under”) + tendere (“to stretch, extend”), itself a semantic loan from Ancient Greek ὑποτείνω (hupoteínō, “to subtend”), from which hypotenuse also derives. See tend.
来源：wiktionary