What is a map key ? what does a map key do?

What is an additional type of erosion found at the coast? what does it mean?

Find the area of the shaded region.

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