I have trouble understanding this please help

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Find the ratios of the corresponding sides