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# Teaching Plan of Periscpe
## CyrusN
---
# Background
- 55 mins
- Target: F3
- No of students: 26
---
# Objective
- 鏡像反射定律
- 加強學生利用平面圖展示立體圖形
+ 例如可用開展讓學生更能了解
- 了解直角等腰三角形的**.text-danger[斜邊與高]**的比例 $\sqrt{2}:1$
+ 有助學生了解三角的特別角
- 增潤知識
+ A 系紙的長闊比為 $\sqrt{2}:1$
---
# 白銀比例的應用
$\sqrt{2}:1$
- [A4 紙的長闊比](https://www.wikiwand.com/en/Silver_ratio#/Paper_sizes_and_silver_rectangles)
- [白銀比例 - Wikipedia](https://en.wikipedia.org/wiki/Silver_ratio)
---
# A4 紙的長闊比
- 長:297mm
- 濶:210mm
- Ratio:
+ $\displaystyle \frac{297}{210}=1.41 (3 sig. fig.)$
---
# Making of
.img-50.center[
![makingof](https://docs.google.com/drawings/d/e/2PACX-1vRgRDsAHOplXRh8Ez_HPAuqdgH2Bn2I2tRX-s8YBUw87LToE40bho3EQOF1UOu4VoaZgd2lwkMFCvRR/pub?w=960&h=720)
]