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↑PQ=↑OQ-↑OP なので、
|↑PQ|²＝|↑OQ-↑OP|²
＝|-s↑a+(1-t)↑b+t↑c|²
＝(-s↑a+(1-t)↑b+t↑c)•(-s↑a+(1-t)↑b+t↑c)
というように計算していきます
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