Free Quarter Pipe Plans. Here you will find free original plans for a 4 feet high 8 feet wide quarter pipe with a 4 foot platform. This quarterpipe is perfect for both skateboarding and aggressive skating, it works for bmx riding, but is a little small to do much with on a bike. It took me about three hours to build. The total cost of this quarterpipe is about $200.
Willis Island (Coral Sea) Not to be confused with Willis Islands. Willis Island is the only permanently inhabited island in the Coral Sea Islands Territory, an external territory of Australia, located beyond the Great Barrier Reef in the Coral Sea. The island is located some 450 kilometres (280 mi) east of Cairns, Queensland.
The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: 1  Anterior cerebral artery (left and right). 2  Anterior communicating artery. 3  Internal carotid artery (left and right).4  Posterior cerebral artery (left and right). 5  Posterior communicating artery (left and right).Redirected from Circle of willis). The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures.