Title

The Area of a Circle

Document Type

Article

Publication Date

2011

Abstract

The geometrical shapes in Fig. 1 recently came into the Greenslade Collection. The semi‐triangular pieces of wood looked like slices from a pie, each 22.5° in angular width. They were tied together with a thin leather band tacked around their curved surfaces. What is this apparatus?

Journal

The Physics Teacher

Volume

49

First Page

160