1) Deltas 2) Polygons 1) Drafting instruments 2) Sources of romantic conflict 3) Three-sided figures 
Advanced warning triangles are folded flat and stored in your car until needed. In the event of a breakdown the warning triangle is used to warn other road users if your car is causing an obstruction. You should place the warning triangle on the road at least 45 metres (147 feet) behind your broken-down vehicle on the same side of the road, or use ...