 IN MATH: 1. n. a line segment having the circle's (or sphere's) center as one endpoint and a point on the circle (or sphere) as the other endpoint. 2. n. distance from the center of the circle (or sphere) to any point on the circle (or sphere). EX. Is the earth's radius 4,000 miles?

IN ENGLISH: 1. as defined above. 2. the distance from the center of a circular thing to its outside.

Circle
Circles are describe in terms of their radius or diameter.
The circumference is the perimeter of a circle. The circumference,
in terms of radius, or
in terms of diameter, The area,
in terms of radius, or
in terms of diameter, Using a radius of:      The ( or ) is:     square units or units.
 Using a diameter of:      The ( or ) is:     square units or units.

 See: FINALLY PLEASE READILY EXCUSE MY DEAR AUNT SALLY - order of operations tutorial home page Math Functions - computes distance, areas, lengths, square roots, raises to a power area.xls -- computes the areas and perimeters of rectangles, parallelograms, triangles, trapezoids, circles. area.doc -- A Word® document with area formulas for a rectangle, parallelogram, triangle, trapezoid, circle.

APPLICATION: See list 260.

1. Determine the radius if the diameter is 5 cm.

2. Compute the radius if the area of a circle is .  This is a page from the dictionary MATH SPOKEN HERE!, published in 1995 by MATHEMATICAL CONCEPTS, inc., ISBN: 0-9623593-5-1.   You are hereby granted permission to make ONE printed copy of this page and its picture(s) for your PERSONAL and not-for-profit use.