For this case we use the formula of distance between points. We have then: d = root ((x2-x1) ^ 2 + (y2-y1) ^ 2) For AB: AB = root ((4 - (- 1)) ^ 2 + (4-3) ^ 2) AB = 5.099019514 For AC: AC = root ((8 - (- 1)) ^ 2 + (1-3) ^ 2) AC = 9.219544457 For BC: BC = root ((8-4) ^ 2 + (1-4) ^ 2) BC = 5 We observe that it has three sides with different dimensions, therefore, the triangle is scalene. Answer: Scalene
