Help with these question and steps if you don't mind

Find the exact area inside the polar curve r = 4 + 2 cos 0. [8 points] Consider a triangle with vertices A(2, -3,4), B(1,0, -1) and C(3,1,2). Find AB + BC + CA. [8 points] What is the unit vector that makes an angle 0 = , with the positive x-axis? Show work to support your answer. [4 points]