Similar Figures

Similar Figures

Similar figures have the same shape but a different size.

Figures are similar if:

• Corresponding angles are congruent (meaning they are equal)

• Corresponding sides are proportionate

The ratio of corresponding sides is called the scale factor.

Similar Figures

Let's Go!

Take out your Math Binder.
Follow along with the video and take notes in your binder.

Pause the video if you need to.

Now Your Turn to Try a Few!

Multiple Choice

#8: Determine whether the figures are similar.

If they are, give the

scale factor of Figure A to Figure B.

• Yes, they are similar. The scale factor is:

  $$\frac{1.5}{3}$$

• N

Multiple Choice

#9: Determine whether the figures are similar.

If they are, give the

scale factor of Figure A to Figure B.

• Yes, they are similar.

  The scale factor is:

  $$\frac{4}{5}$$

• No, they are not similar.

Now Your Turn to Try a Few!

Multiple Choice

#13: Given each pair of figures are similar, set up and solve a

proportion to find the missing side.

• x = 6.6

• x = 1.36

• x = 3.6

• x = 7.2

Multiple Choice

#14: Given each pair of figures are similar, set up and solve a

proportion to find the missing side.

• x = 16

• x = 36

• x = 25

Multiple Choice

#15: Given each pair of figures are similar, set up and solve a

proportion to find the missing side.

• x = 1.67

• x = 5.4

• x = 3.75

• x = 3.6

You can set up a proportion to find a missing side length.

Figures will be similar if:
- Their corresponding angles are congruent (equal)
- Their corresponding sides are proportional

Let's Review Today's Lesson

Homework

Homework 7, #1-16
in Edulastic