Explain it

03.01 — 2 short write-ups

Question 1 of 2

A checkpoint, not a test

Dilate from a fixed center

The center of dilation is (1, 2), the scale factor is 2, and P is (4, 3). Find P′ and explain why multiplying P’s coordinates by 2 would give the wrong point.

Start with the horizontal and vertical change from the center to P.

Question 2 of 2

A checkpoint, not a test

What stays the same?

A triangle is dilated by a scale factor of 3. Explain what happens to its side lengths and angle measures, and whether its image is similar, congruent, or both.

Similarity and congruence make different demands about lengths.