# Supplementary Angles

## Description

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow show the Theorem: If two adjacent angles have their exterior sides in a straight line, these angles are supplementary.

## Keywords

180 degrees, angle, angles, geometry, straight line, sum, supplement, supplementary, supplements

## Galleries

## Source:

G.A. Wentworth *Plane And Solid Geometry* (Boston: Ginn & Company, 1899) 16

Courtesy the private collection of Roy Winkelman