Someone help with the first one

Find the area of the regular hexagon if a side is 20 cm.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

`if you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain. ''.