How is a wavelength measured? a. from crest to crest b. from trough to crest c. from sea level to trough d. from sea level to crest

Rectangle qrst is shown. angle qrt is congruent to angle str, and angle str is complementary to angle qtr. which statement is true about angles qrt and qtr? they are congruent. they are complementary. they are supplementary. they are right angle