Technical Drawing Concepts

What is Radius?

• The radius of a circle is the length of the line from the center to any point on its edge. The plural form is radii (pronounced "ray-dee-eye"). In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle.

Radius

dIAMETER

• Diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

dIAMETER

What is Length?

Length is the most extended dimension of an object.

what is Perimeter?

• The word perimeter means a path that surrounds an area. It comes from the Greek word 'peri,' meaning around, and 'metron,' which means measure.

The perimeter is the distance around a two-dimensional shape.

References

• (n.d.). Retrieved July 19, 2016, from http://study.com/academy/lesson/what-is-perimeter-definition-formula-quiz.h... Diameter. (n.d.). Retrieved July 19, 2016, from https://en.wikipedia.org/wiki/Diameter Length. (n.d.). Retrieved July 19, 2016, from http://www.mathsisfun.com/definitions/length.html Radius of a circle - math word definition - Math Open Reference. (n.d.). Retrieved July 19, 2016, from http://www.mathopenref.com/radius.html The definition of length. (n.d.). Retrieved July 19, 2016, from http://www.dictionary.com/browse/length