EntityQ339495· pop 37· linked from 144 articlesaltitudeSign in to saveline segment in a triangleConnectionsacute or obtuse triangleEntitygeometryEntitytriangleEntityInternational Standard Book NumberEntityangleEntityPythagorean theoremEntitylineEntitypointEntitytrigonometric functionEntityright triangleEntityequilateral triangleEntityline segmentEntityhypotenuseEntityHeron's formulaEntitylaw of sinesEntitylaw of cosinesEntityisosceles triangleEntityperpendicularityEntitycongruenceEntityvertexEntityCategoriesLines defined for a triangle