In all exercises below, give exact answers. This means, in particular, that if your answer is a number such as v5 or , it should appear on your paper in

this form, and not in the (necessarily approximate) decimal form that your calculator might give you if you type v5 or .3 a) Is this an acute angle, a right angle, an obtuse angle, a straight angle, or none of these? Explain how you can tell. (b) Convert the angle in degree measure. (c) Find the length of the arc, and the area of the circle sector spanned by a on the circle centered atthe origin and of radius 4. (d) Find the length of the arc, and the area of the circle sector spanned by a+27 on the circle centered at the origin and of radius 4. (e) Find at least three distinct angles that are co terminal to a, and explain why they are coterminal to a.