Suppose the area of a circle is 4π. what is its diameter?

Area=pi times radius^2 so

if area=4pi=pi times r^2
4 times pi=r^2 times pi
divide both sdies by pi
4=r^2
square root
2=radius since legnth cannot be negative

radius=1/2 diamters
2 radius=diameter
2(2)=diameter=4
diameter=4

Sin(a)+cos(a)+cot(a)-1=2(csc(x)+1)