Because the prehistoric surveyors were very good at rope and peg methods of laying out. A circle is easy, the next easiest shape is a hexagon ( and there are 30 uprights in the circle so you can see where that's coming from). A circle is what they wanted but it also included a massive 'horseshoe' shaped array of 10 lintel-topped stones. In fact Stonehenge was laid out entirely using 'circles and arcs'.
The major stones of Stonehenge are mostly sandstone, others are igneous rocks.
The main mystery is what was it built for?
No it is not true
No, the Stonehenge is a stone circle made by early Britons.
It could be said that it is the world's most famous prehistoric monument. Stonehenge was built in several stages. The first part was built 5,000 years ago and the stone circle was erected about 2500 BC. Modern scholars have found burial grounds in and around the site. Yet, its purpose is still not known why it was built. The stones in the circle have been brought all the way from Preseli Wales 200 miles from where Stonehenge sits on the Salisbury Plain. Today nearly a million people a year visit a site.
Stone henge..
It is a stone circle
Stonehenge is thought to have been built by the beaker people.
People
It is called Stonehenge and it stands on the Salisbury Plain
Stonehenge was built by people so the answer to your question is no.
Stonehenge is not a natural formation, it was built by people.
Stonehenge was first seen by the ancient people who built it.
No it is a stone circle
Stonehenge is a large henged stone circle it is not and never has been a settlement.
No it was not built by Egyptians
Not century but millennium. Stonehenge was built around 5000 years ago, but nobody knows for absolute certainty.