Converse: If you cannot comprehend geometry you do not know how to reason deductively. contra positive: If you can comprehend geometry you know to reason deductively.Converse: If you cannot comprehend geometry you know how to reason deductively. contra positive: If you cannot comprehend geometry you know to reason deductively.Converse: If you can comprehend geometry you do not know how to reason deductively. contra positive: If you can comprehend geometry you do not know to reason deductively.Contra positive: If you cannot comprehend geometry you do not know how to reason deductively. converse: If you can comprehend geometry you know to reason deductively.