Question

If P ( 1,2) and Q (2,1) then PQ = ______
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Answer 1

Step-by-step explanation:

pq2=(1-2)^2+(2-1)^2

pq2=1+1

pq=√2

Answer 2

• PQ=√(x2-x1)²+(y2-y1)²
• √(1-2)²+(2-1)²
• √(-1)²+(1)²
• ✓1+1
• √2

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