27 millimeters • 1 cm/10mm

Is the orthocenter of a triangle on the inside ?

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?

Which expression is equivalent to the expression shown?