Q:

ΔCAR has coordinates C (2, 4), A (1, 1), and R (3, 0). A translation maps point C to C' (3, 2). Find the coordinates of A' and R' under this translation. (6 points) A' (4, −2); R' (2, −1) A' (−2, 2); R' (2, −2) A' (2, −1); R' (4, −2) A' (−1, 0); R' (−2, 2).

Accepted Solution

A:
Answer: [tex]A'= (2,-1)[/tex] and [tex]R'=(4,-2)[/tex] under this translation.Step-by-step explanation:A translation in [tex]R^{2}[/tex] is a mapping T from [tex]R^{2}[/tex] to [tex]R^{2}[/tex]  defined by [tex]T(x,y) = (x + v_1,y+v_2)[/tex], where [tex]v=(v_1,v_2)[/tex] is a fixed vector in [tex]R^{2}[/tex]. From the problem we know that [tex]T(2,4)=(3,2)[/tex], so we need to find the values [tex]v_1[/tex] and [tex]v_2[/tex] such that  [tex]T(2,4) = (2 + v_1,4+v_2)=(3,2)[/tex], so [tex]3=2 + v_1[/tex] and [tex]4+v_2=2[/tex], thus [tex]v_1=1[/tex] and [tex]v_2=2[/tex]. Then [tex]T(x,y) = (x + 1,y-2)[/tex] and  [tex]T(1,1)=(1+1,1-2)=(2,-1)=A'[/tex][tex]T(3,0)=(3+1,0-2)=(4,-2)=R'[/tex] Therefore [tex]A'= (2,-1)[/tex] and [tex]R'=(4,-2)[/tex]. The triangles CAR and C'Q'R' are shown in the figure below.