Read the passage below and determine the part of speech of the underlined word. he was a huge man in a bright red robe (bright as holly berries) with a hood that had fur inside it and a great white beard that fell like a foamy waterfall over his chest.…

The correct answer is adjective.
Adjectives are words used to describe nouns and pronouns - usually they can be found very near to them. In this case, the adjective bright (as holly berries) further describes the red robe - it gives us more information and details as to what the robe looks like.

Perpendicular line? no.