さんかくじゃなかったです
三角槭じゃなかったです
sankaku janakattadesu

Noun
Desu Copula

The polite, past negative form of さんかくかえで

1. Wasn't a triangle maple.; Wasn't a three-lobed maple.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana