Question

help please whice h i foreach is rih

Answer 1

Triangle ABC is a "right" triangle and "scalene" (because no side is equal).

BC^2 = 1^2 + 2^2
(from B(-1,1) and C(0,-1) ; x=|xc-xb|= |0-(-1)| = 1 , y=|yc-yb|= |-1-1| =2)

BC^2 = 1+4
so the measure of BC = √5 ≈ 2.2