What is the measure of the tangent ab?

Ineed with this. the figure is made up of a square and a rectangle. find the area of the shaded region.

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm