Size Changes

Important Definitions size change images: when figures have the same shape and tilt k: magnitude expansion: when k>1 contraction: when 0

Lesson 12-2Size Changes

Finding the Origin of a Size Change

Finding the Magnitude of a Size Change OE=k*OA Substitute in the values of OE and OA by measuring64=k*40Solve for k64/40=kk=1.6To check pick another point and check it in the equationCould use segments OH and OD to check

Finding the Magnitude

Draw lines through corresponding points for all of the figure.

Continue the lines until they all meet.

Draw the point where they all meet, this is the center.

Finding the Magnitude of a Size Change

k=1

k=1