From dc587fbf02528906559bfbba9e5d78ee0cf2abf6 Mon Sep 17 00:00:00 2001
From: kazu634 <simoom634@yahoo.co.jp>
Date: Sun, 14 Jun 2020 11:47:14 +0700
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---
 .../visualization/2020-06-13-different-types-of-graphs.md    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/content/labs/visualization/2020-06-13-different-types-of-graphs.md b/content/labs/visualization/2020-06-13-different-types-of-graphs.md
index 3d58392..ae62fe3 100644
--- a/content/labs/visualization/2020-06-13-different-types-of-graphs.md
+++ b/content/labs/visualization/2020-06-13-different-types-of-graphs.md
@@ -157,6 +157,11 @@ chart=true
 });
 {{< /chart >}}
 
+#### 円グラフの利用が推奨されない理由
+以下、2つの理由があるそうです:
+
+- 総量がわからないので違う円グラフの内訳と比較できない
+- 時系列データを用いた時間経過による内訳の推移を表現できない