Subtended - GCSE Maths Definition
Reviewed by: Dan Finlay
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In GCSE Mathematics, an angle is subtended at a point by two lines (that create the angle) that have something relating them.
For example, the angle at the centre of a circle is subtended by a chord - the two lines making this angle would meet at the centre of the circle, one of them would end at one end of the chord; the other line would end at the other end of the chord.
An angle could be subtended at the circumference of a circle - also by a chord. The word subtended is used frequently in the definitions of circle theorems.
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