Triangle

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted .

In Euclidean geometry any three points, when non-collinear, determine a unique triangle and a unique plane (i.e. a two-dimensional Euclidean space). This article is about triangles in Euclidean geometry except where otherwise noted.

Types of triangle

By lengths of sides

Triangles can be classified according to the lengths of their sides:

Chapel Hill

Chapel Hill or Chapelhill may refer to:

Area

Area is the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane. Surface area is its analog on the two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat. It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).

The area of a shape can be measured by comparing the shape to squares of a fixed size. In the International System of Units (SI), the standard unit of area is the square metre (written as m²), which is the area of a square whose sides are one metre long. A shape with an area of three square metres would have the same area as three such squares. In mathematics, the unit square is defined to have area one, and the area of any other shape or surface is a dimensionless real number.

American Cancer Society

The American Cancer Society (ACS) is a nationwide voluntary health organization dedicated to eliminating cancer. Established in 1913, the society is organized into eleven geographical divisions of both medical and lay volunteers operating in more than 900 offices throughout the United States. Its home office is located in the American Cancer Society Center in Atlanta, Georgia. The ACS publishes the journals Cancer, CA: A Cancer Journal For Clinicians and Cancer Cytopathology.

History

The society was originally founded on May 23, 1913 by 15 physicians and businessmen in New York City under the name American Society for the Control of Cancer (ASCC). The current name was adopted in 1944. According to Charity Navigator the ACS is one of the oldest and largest volunteer health organizations.

At the time of founding, it was not considered appropriate to mention the word ‘cancer’ in public. Information concerning this illness was cloaked in a climate of fear and denial. Over 75,000 people died each year of cancer in just the United States. The top item on the founders’ agenda was to raise awareness of cancer, before any other progress could be made in funding research. Therefore a frenetic writing campaign was undertaken to educate doctors, nurses, patients and family members about cancer. Articles were written for popular magazines and professional journals. The ASCC undertook to publish their own journal, Campaign Notes, which was a monthly bulletin with information about cancer. They began recruiting doctors from all over the United States to help educate the public about cancer.