Question

the shadow represented by △abc changes to form △abc.
what happens to the shadow?
choose all that apply.
it changes shape.
it changes size.
its vertices move along the rays.
it changes position.

Explanation:

Step1: Analyze shape

Triangles \( \triangle ABC\) and \( \triangle A'B'C'\) are similar (same - shape, different - size), so it does not change shape.

Step2: Analyze size

Since \( \triangle A'B'C'\) is larger than \( \triangle ABC\), it changes size.

Step3: Analyze vertices movement

From the figure, vertices \(A\to A'\), \(B\to B'\), \(C\to C'\) move along the rays (the dotted lines).

Step4: Analyze position

The location of \( \triangle A'B'C'\) is different from \( \triangle ABC\), so it changes position.

Answer:

B. It changes size, C. Its vertices move along the rays, D. It changes position.