2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/174347We give some concrete constructions of real equiangular line sets. The emphasis here is on {\em building blocks} for certain angles which are then used to build up larger equiangular line sets. We concentrate on angles greater than or equal to 1/7.Metric Geometry51M04text