Edge is related to Angle. Angle is a synonym of Perspective. 
Scale is related to Stand. Stand is the opposite of Walk. Walk is related to Use. Use is related to Fly. 
Edge <--RelatedTo--> Angle <--Synonym--> Perspective 
Scale <--RelatedTo--> Stand <--Antonym--> Walk <--RelatedTo--> Use <--RelatedTo--> Fly 