Definitions from Wiktionary (subtend)

▸ verb:  (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.
▸ verb:  (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.
▸ verb:  (transitive, mathematics) To form the central angle of a circle underneath an arc.
▸ verb:  (botany, transitive) To stand beneath or close to, as a bract at the base of a flower.
▸ Also see subtend



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