13 5 (9, 4 The angle of the direction opposite the point (9, (9,7) is a = 5 4 5m 4 Step 3 We have found that the angle of the direction opposite the point (9, 1) is = 5. Therefore, the point opposite (9, 57) = (9+) st 5 should be our original point. This is in fact an example of the general fact that (-r, 6) 4 represents the same point as (r, 0+ ). Therefore, a pair of polar coordinates that represent the same point as (9) but with r