## Individual Research Projects Section 7.5

### Project 7.5

Historical Quest
The Historical Note in Section 7.5 asks the question, Why did the Egyptians build the pyramids using a slant height angle of about 44° or 52°? Write a paper answering this question.

References:
Arthur F. SmithSee the whole entry

## Video Links 7-2

Videos:
This is a video discussing polygons (time: 6:35)

Low key introduction to angles (time: 9:55)

Here is a video on angles and parallel lines (time: 6:03)
See the whole entry

## Homework Hints 7-4

[tippy title=”Problems 1-2″]Problems 1-2
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid to give your opinion. For the most part, these questions do not have “right” or “wrong” answers. You … See the whole entry

## Homework Hints 7-3

[tippy title=”Problems 1-4″]Problems 1-4
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid to give your opinion. For the most part, these questions do not have “right” or “wrong” answers. You … See the whole entry

## Homework Hints 7-2

[tippy title=”Problems 1-8″]Problems 1-8
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid to give your opinion. For the most part, these questions do not have “right” or “wrong” answers. You … See the whole entry

## 7.3 Outline

1. Terminology
1. six parts of a triangle
2. classifying triangles
1. by sides
1. scalene
2. isosceles
3. equilateral
2. by angles
1. acute
2. right
3. obtuse
3. congruent triangles
1. construction
2. corresponding parts
2. Angles of a triangle
1. angles in a triangle
2. exterior angle
3. exterior angle property
3. Isosceles triangle
See the whole entry

## 7.2 Outline

1. Angles
1. vertex (pl. vertices)
2. angle
3. notation for angles
4. equal angles
5. degree
6. classifications
1. acute
2. right
3. obtuse
4. straight
7. congruent angles
8. complementary angles
9. supplementary angles