A square that is 9 cm on a side is placed inside a rectangle that has a width of 12 cm and length of 18 cm. Okay what is the area of the region inside the rectangle that surrounds the square?

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.