Area of a Triangle

Marina is a huge sports fan and likes to show her team spirit in every way possible. Marina owns all of her favorite players jersey's as well as pennants from all of her favorite teams.

The pennant for her favorite basketball team has a base of $9$ inches and two sides that measure $16.6$ inches each.

The pennant for her favorite football team is $8$ inches wide and $18$ inches long.

The pennant for her dream college has a base of $6$ inches and a height that is four times the base.