平行な直線の傾きが等しいことを確かめましょう．傾きの値によって，2つの直線が交わらない（平行になる）仕組みを調べてみます．
- Resource Type
-
Activity
- Tags
-
- Target Group (Age)
- 15 – 19+
- Language
- Japanese / 日本語
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