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√(xB-xA)²+(yA-yB)² = √(6-2)²+(6-3)² = √16+9=√25=5
b) C=(-4,1) D=(4,-3)
√(xD-xC)²+(yD-yC)² = √(4-(-4))²+(-3-1)² = √64+16=√80
c) E=(-1,3) F=(-3,-4)
√(xF-xE)²+(yF-yE)² = √(-3-(-1))²+(-4-3)² = √4+49=√53
d) G=(3,-4) H=(-2,-4)
√(xH-xG)²+(yH-yG)² = √(-2-3)²+(-4-(-4))² = √25+0=√25=5