What area in miles is 150 km squared?
A mile is not a measure of an area so, as asked, the question
has no answer.
Unfortunately, 150 km squared is ambiguous since it could refer
to an area of 150 square kilometres (say 10 km by 15 km) OR an area
of the square with sides of 150 km.
150 square km = 57.92 square miles
150 km square = 22500 square km = 8687.3 sq miles = 93.21 miles
square.