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shotgun981
I believe this is how you do it... 
AI=5, 5 squared=25
IF=12, 12 squared=144
144+25 (only because line A F is bigger than AI or IF does it add)
A F=169
Banabanana
АІF is the right triangle (АF is the hypotenuse)
By the Pythagorean theorem:

АF² = AI² + IF² = 5² + 12² = 25 + 144 = 169
АF = √169 = 13 units

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