Dilations!Part 2

4 3 2 1 0In addition to level 3.0 and above and beyond what was taught in class, I may: Make connection

with real-world situations

Make connection with other concepts in math

Make connection with other content areas.

I understand and use informal arguments to prove congruency and similarity using physical models, transparencies or geometry software. informally prove

similarity of triangles

Use scale factors to create and analyze dilations.

I understand congruency and similarity using physical models, transparencies or geometry software. construct

triangles Calculate

dilations with scale factors.

With help from theteacher, I have partial successwith the unit content.

Even with help, I have no success with the unit content.

Learning Goal 1 (8.G.A.3 & 4):The student will understand and use informal arguments to prove congruency and similarity using physical models, transparencies or geometry software.

Dilations make similar figures.

• Similar means same shape but different size.

• Are the following figures similar?

How can you tell that shapes are similar?

Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure.

Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure.

Is the dilation an enlargement or reduction from the shaded figure to the non-shaded figure.

How do you find the scale factor?• Take the second figure’s size and divide

it by the first figure’s size.

8 4

4 = 8 ½

Find the scale factor for the dilation from the solid figure to the dashed line figure.

164

4 = 16

1/4

Find the scale factor for the dilation from the solid figure to the dashed line figure.

618

18 = 6 3

Find the scale factor for the dilation from the solid figure to the dashed line figure.

2448

48 = 24 2