Continuing with Exercise 101, make a conjecture about which viewing rectangles result in the graph of a circle with radius 5 and center at the origin appearing circular. 

i. [-9,9,1] by [-6, 6, 1] 

ii. [-5, 5, 1] by [-10, 10, 1] 

iii. [5, 5, 1] by [-5, 5, 1] 

iv. [-18, 18, 1] by [-12, 12, 1] 

Test your conjecture by graphing this circle in each viewing rectangle. (Graph y₁ = √25 - x² and y = - √25 - x² to create the circle.)

Data from Exercise 101:

Graph the lines y = 1/2x and y = -x in the standard viewing rectangle.