Warm-Up

Practice #69 on the iPad

Vocabulary

• Scale factor- how much a shape is enlarged (bigger) or reduced (smaller).– Scale factor > 1 = bigger– Scale factor < 1 = smaller

• Dilation- transformation that changes the size but not the shape of a figure.

Example

Determine the scale factor used to dilate ΔABC into ΔDEF

Fraction: Ratio: Decimal: Percent:

A

B C

D

E F15

18 21 8

Example

Determine the coordinatesof ΔA’B’C’ if ΔABC is dilated by a factor of: a)

b) 4