Greenland is a big island. the continent of africa is much larger than greenland. but on some maps greenland and africa appear to be almost the same size. why?

Green land and Africa appear to be of the same size because the Mercator projection creates distortions in size as we move away from the equator. The distortion is severe near the poles, this inability to compare size on Mercator projection is called The Greenland problem. Although Greenland is fourteen times bigger than Africa it appears to be smaller than it. The cropping technique used in Mercator projection causes these distortions.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;