Find the length of an arc of 40 degrees in a circle with an 8 inch radius

The mathematical expression 9€ t means

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Find the area of the regular hexagon if a side is 20 cm.