+73 Line AC is perpendicular to the circle centered at O with radius 1 unit. The length of AC is 1.5 units.
+1005 Using the pythogoream thereom, OA is the square root of (1.5)^2 + 1^2 = 3.25.
The exact answer is sqrt(3.25) - r = sqrt(3.25) - 1, and it's about 0.80
If you don't understand anything feel free to ask.
