2.4-exploring similar triangles - engage explore...
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![Page 1: 2.4-Exploring Similar Triangles - ENGAGE EXPLORE INSPIREengageexploreinspire.weebly.com/uploads/2/4/9/0/24901868/... · 2018-09-09 · SimilarTriangles! Facts&about&Similar&Triangles!](https://reader033.vdocuments.net/reader033/viewer/2022043018/5f3a2cb1fc00421458650842/html5/thumbnails/1.jpg)
MFM2PI – Unit 2: Similar Triangles – Lesson 4 Date:___________ Learning goal: determine if triangles are similar and use the scale factor to find missing sides.
Exploring Similar Triangles
Use the triangles below to answer the following questions
1. Which angle corresponds to ∠ 𝐴? __________
2. Which angle corresponds to ∠ 𝐵? __________
3. Which angle corresponds to ∠ 𝐶? __________
4. Does each angle and its corresponding angle have the same measurement? YES or NO? __________
5. Which side corresponds to 𝐴𝐵? __________
6. Which side corresponds to 𝐶𝐵? __________
7. Which side corresponds to 𝐴𝐶? __________
8. What is the ratio of side 𝐴𝐵 length to the length of its corresponding side? __________ lowest terms: __________
9. What is the ratio of side 𝐵𝐶 length to the length of its corresponding side? __________ lowest terms: __________
10. What is the ratio of side 𝐴𝐶 length to the length of its corresponding side? __________ lowest terms: __________
11. Are all three ratios equal? YES or No? __________
12. What is the scale factor of △ 𝐴𝐵𝐶 to △ 𝐷𝐸𝐹? __________
13. Is △ 𝐴𝐵𝐶 ∽ △ 𝐷𝐸𝐹? __________
Example 1: Are the following triangles similar?
R
G
K
N P
T
8cm
15cm
17cm 16cm
30cm
34cm
300
600
600
300
E F
D
12 cm
21 cm
15 cm 1020
440 340 B C
A
4 cm
7 cm
5 cm 1020
440 340
![Page 2: 2.4-Exploring Similar Triangles - ENGAGE EXPLORE INSPIREengageexploreinspire.weebly.com/uploads/2/4/9/0/24901868/... · 2018-09-09 · SimilarTriangles! Facts&about&Similar&Triangles!](https://reader033.vdocuments.net/reader033/viewer/2022043018/5f3a2cb1fc00421458650842/html5/thumbnails/2.jpg)
Similar Triangles Facts about Similar Triangles
1. Corresponding angles are equal. <A = <D <B = <E <C = <F
2. The ratios of the corresponding sides are equal. DE = EF = DF AB BC AC *there is a constant scale factor between each of the side length.
Example 2: The following diagram shows two similar triangles:
a) What is the scale factor from triangle ABC to triangle DEF? b) What is the length of side EF?
Example 3: The following diagram shows two similar triangles: a) What is the scale factor from triangle EFG to triangle EBD? b) What is the length of side GE?
![Page 3: 2.4-Exploring Similar Triangles - ENGAGE EXPLORE INSPIREengageexploreinspire.weebly.com/uploads/2/4/9/0/24901868/... · 2018-09-09 · SimilarTriangles! Facts&about&Similar&Triangles!](https://reader033.vdocuments.net/reader033/viewer/2022043018/5f3a2cb1fc00421458650842/html5/thumbnails/3.jpg)
Example 4: The following diagram shows three similar triangles:
a) What is the scale factor from triangle HIJ to triangle EFG?
b) What is the length of side EG?
c) What is the length of side AB?
Example 5: Triangles ABC and DEF are similar.
a) List the corresponding angles b) List the corresponding sides
![Page 4: 2.4-Exploring Similar Triangles - ENGAGE EXPLORE INSPIREengageexploreinspire.weebly.com/uploads/2/4/9/0/24901868/... · 2018-09-09 · SimilarTriangles! Facts&about&Similar&Triangles!](https://reader033.vdocuments.net/reader033/viewer/2022043018/5f3a2cb1fc00421458650842/html5/thumbnails/4.jpg)
Example 6: Sketch a triangle that is similar to each triangle. Label each triangle with its side lengths.
a) b) c)
Example 7: State whether or not the following triangles are similar and support your answer.
Example 8: Find the lengths of the missing sides. All measures are centimeters unless otherwise stated. a) b)
5
3
15
a
20
15
12
b