d = 2√2
Hi there !
use formula
d = √(x₂ - x₁)² + (y₂ - y₁)²
= √(3 - 1)² + (4 - 2)²
= √2² + 2²
= √4 + 4
= √8
= √2³
= 2√2
(1 ; 2)
1 = x₁ ; 2 = y₁
(3 ; 4)
3 = x₂ ; 4 = y₂
Good luck !
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