How can you find the perimeter of the rhombus?
Find One-half(QS)(RT).
Find One-half(QT)(TS).
Use the distance formula to find QT, then multiply by 4.
Use the distance formula to find QT and QR, add the distances, then multiply by 4.

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?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?