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d = √(x₁-x₂)²+(y₁-y₂)²
Maka,
a.)
d = √(3-6)²+(5-1)²
d = √(-3)²+4²
d = √9+16
d = √25
d = 5 satuan
b.)
d = √(-1-4)²+(-7-5)²
d = √(-5)²+(-12)²
d = √25+144
d = √169
d = 13 satuan
c.)
d = √(9-2)²+(5-6)²
d = √7²+(-1)²
d = √49+1
d = √50
d = 5√2 satuan