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Line AC is perpendicular to the circle centered at O with radius 1 unit. The length of AC is 1.5 units.

 May 8, 2020
 #1
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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.

 May 8, 2020

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