Question

calcule a distância entre o ponto P à reta r
P(-5,2) e 2x +y -5=0

Answer 1

2x + Y - 5 = 0 ==> A=2...B=1...C=-5
P( -5, 2 ) ======> x=-5.....y=2

D = lAx + By + C l / √A²+B²
D = l2.-5 +2.1 - 5 l / √2²+1²
D = l-10 +2 - 5l / √5
D = 13/√5 × (√5/√5) = 13√5/ 5 ✓