\chapter{Trigonometry I}
\section{Special angles and arc length}
Answer the questions.
\begin{enumerate}
\item
What is a quadrantal angle?
\item
Is \(450^\circ\) a quadrantal angle?
\item
What is a special angle?
\item
Is \(100^\circ\) a special angle?
\item
What is the arc length formula?
\item
Suppose we need to find the arc length determined by a \(90^\circ\) angle. Is it right to
use \(\theta=90\) in the arc length formula?
\item
In a circle of radius \(1\) ft, we measure an arc of length \(1\) ft. What is the degree measure
of the corresponding angle?
\end{enumerate}