Finally caught up… which means I’m still one article behind 
Well, I read the introduction of this weeks WP article but I’m not sure if I’ll go into the details…
Also, after watching the Math 2.1 and 2.2 videos from last week I feel like “trigonometric functions” might not be the best article to solidify the vocab from those videos. How do guys feel? Maybe 幾何学 would have been a better choice? 
I also caught up on the “history of natural numbers” part. Thanks @miwuc senpai for sharing the quiz. I was quite surprised when I read that section.
Upcoming week we will learn about data visualization if I recall correctly. So yes, some of the topics are loosely connected to mathematics.
Last but not least… some quizzes about the content of week three 
Q12: 平面図形を選んでください。
- 台形
- 正方形
- 直線
- 平行四辺形
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Q13: 円の性質を選んでください。
- 中心
- 半径
- 直径
- 円周
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Q14: 立体を選んでください。
- 円
- 円柱
- 円錐
- 楕円
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Q15: 体積を計算する公式は何ですか。
- 広さ \times 長さ \times 高さ
- x 座標 \times y 座標
- 横幅 \times 奥行き \times 高さ
- 面積と同じ
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Q16: Bonus: 尺貫法の単位を選んでください。
- 理
- 寸
- 尺
- 割
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