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|OK|=3
Z tw. Pitagorasa:
|OK|²+|PK|²=|OP|²
|PK|=4
BP:AP=3:2
2BP=3AP
BP=3AP/2
Z tw. o siecznej okręgu mamy:
|PK|²=|BP|×|AP|
4²=3|AP|/2×|AP|
16=3|AP|²/2
32=3|AP|²
|AP|²=32/3
|AP|=√32/3=4√2/√3=4√6/3
BP=3AP/2=3×4√6/6=2√6
|AB|=|BP|-|AP|=2√6-4√6/3=2√6/3