Identify a sequence of transformations that maps triangle ABC onto triangle A"B"C" in the image below.

A. clockwise 270° rotation; reflection over x-axis
B. counterclockwise 90° rotation; reduction
C. counterclockwise 270° rotation; reflection over the y-axis
D. enlargement; clockwise 90° rotation


Could someone explain this to me?

Identify a sequence of transformations that maps triangle ABC onto triangle ABC in the image below A clockwise 270 rotation reflection over xaxis B counterclock class=

Respuesta :

The A"B"C" is the red triangle.  What happened is it was a 90 degree rotation around the 0, then an enlargement.  The correct answer is D.  

Hope I helped.  

Answer:

The correct option is B.

Step-by-step explanation:

It is given that triangle A"B"C" is the image of triangle ABC after transformation.

From the given figure it is noticed that the point C lies on positive y-axis and point C" lies on negative x-axis.

It means the figure is rotated either counterclockwise 90° or clockwise 270°. The rotation rule is

[tex](x,y)\rightarrow (-y,x)[/tex]

The corresponding sides of image A"B"C" are smaller than the preimage ABC.  

[tex]k=\frac{A"B"}{AB}=\frac{3}{6}=\frac{1}{2}<0[/tex]

Since k<0, therefore the transformation shows the reduction. The dilation rule is

[tex](x,y)\rightarrow (-\frac{1}{2}y,\frac{1}{2}x)[/tex]

[tex]A(-3,0)\rightarrow (-\frac{1}{2}(0),\frac{1}{2}(-3))\rightarrow (0,-1.5)[/tex]

[tex]B(3,0)\rightarrow (-\frac{1}{2}(0),\frac{1}{2}(3))\rightarrow (0,1.5)[/tex]

[tex]C(0,5.2)\rightarrow (-\frac{1}{2}(5.2),\frac{1}{2}(0))\rightarrow (-2.6,0)[/tex]

Option B is correct.

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