Geometrical figure derived from a gentle arc (9)

I believe the answer is:

rectangle

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'geometrical figure' is the definition.
'rectangle' can be an answer for 'figure' (rectangle is a kind of figure). I'm not sure about the 'geometrical' bit.

'derived from a gentle arc' is the wordplay.
'derived from' indicates an anagram.
'gentle'+'arc'='gentlearc'
'gentlearc' with letters rearranged gives 'RECTANGLE'.

Can you help me to learn more?

(Other definitions for rectangle that I've seen before include "Figure on plane" , "regular sort of figure" , "Four-sided figure" , "Oblong" , "Shape of football pitch" .)

I've seen this clue in The Irish Independent.

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