The Mackenzie River is a river in the Canadian boreal forest. It is the longest river system in Canada. Basin size, 1,805,200 km2 (697,000 sq mi) . The river's main stem is 1,738 kilometres (1,080 mi) long, flowing north-northwest from that of the Mackenzie River is Thutade Lake, in the Northern Interior of British Columbia.
The radius is half the diameter of the circle. If the radius gets larger then the whole circle grows. When the circle gets larger, the area gets larger too.
