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Update Final_Exam_Study_Sheet.md

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Grade 9/Math/MFM1P1/Final_Exam_Study_Sheet.md
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## Rounding and Decimals
### Decimals
- Terms:
- #### Terms:
- Given the number `9123.456`:
- The **`tenth`** is the `4`.
- The **`hundredth`** is `5`.
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- The **`hundreds`** is `1`.
- The **`thousands`** is `9`.
- **Remember, `tens` and `tenths` may sound the same, but they are `DIFFERENT`**!
-
- To round to a **`tenth`**, **`hundredth`**, and **`thousandths`**
- Tenths
- If the `hundredth` is `5` or higher, round up, else, round down.
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|Angle|Description|Example|
|:----|:----------|:------|
|Acute Angle|Less than 90 degrees||
|Right Angle|90 degrees||
|Obtuse Angle|More than 90 degrees||
|Straight Angle|180 degrees||
|Reflex Angle|More than 180 degrees|
|Acute Angle|Less than 90 degrees|<img src="https://www.mathsisfun.com/geometry/images/acute-angle.svg" width="100">|
|Right Angle|90 degrees|<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Right_angle.svg/1200px-Right_angle.svg.png" width="100">|
|Obtuse Angle|More than 90 degrees|<img src="https://www.chilimathwords.com/wp-content/uploads/2018/05/120-degree-obtuse-angle.png" width="200">|
|Straight Angle|180 degrees|<img src="https://www.chilimathwords.com/wp-content/uploads/2018/05/180-degree-straight-angle.png" width="200">|
|Reflex Angle|More than 180 degrees|<img src="https://www.mathematics-monster.com/images5/reflex_angle_q4.jpg" width="200">|
## Angle Theorems