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GCSE Mathematics · key term
A statement meaning that each of two conditions implies the other, so both directions must be true.
Used by OCR
Specification 8.05e · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Revise: Chords and RadiiThe words if and only if join these two implications. Neither direction should simply be assumed when a proof is requested.
Treat “if and only if” as two implications. Be prepared to prove both perpendicular bisects and bisects perpendicular.
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