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Cogito

Geometry · Chapter 4 · Lesson 2

Practice Worksheet

Similar Figures and Scale

Same shape, proportional sides.

11 problems · about 23 minutes · G-SRT.A.2, G-SRT.B.5

NameDate

Figure — use these to answer the problems

Scale a length and compare it with the original.
Before: 6
After: 9
1 1/2 × 6 = 9
Original side6
Multiply by3
Divided by2
Figure 1

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. Sides in ratio 4. Area ratio?

    Answer

  2. 5 corresponds to 20. Scale factor?

    Answer

  3. Factor 4. 3 corresponds to what?

    Answer

  4. Sides in ratio 2. What is the area ratio?

    Answer

Build It Up

The same ideas with more to keep track of.

3 problems

  1. Sides in ratio 3. What is the area ratio?

    Answer

  2. Do similar figures have equal angles? 1 for yes, 0 for no.

    Answer

  3. Do similar figures have equal sides? 1 for yes, 0 for no.

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

4 problems

  1. Areas in ratio 25. What is the side ratio?

    Answer

  2. Factor 0.5. Is the image smaller? 1 for yes, 0 for no.

    Answer

  3. The Factor

    4 corresponds to 12. What is the scale factor?

    Answer

  4. The Missing Side

    Same factor. 7 corresponds to what?

    Answer