Khan/khan-exercises — pull request #19359 by beneater (2012-04-13 04:42:53+00:00)
Title: Split up Geometry 1 exercise

Split this into 4 exercises:

**Perimeter of squares and rectangles**
* square side -> perimeter
* perimeter -> square side
* length & width -> perimeter

**Area of squares and rectangles**
* square side -> area
* area -> square side
* length & width -> area
* area -> perimeter
* perimeter -> area

**Radius diameter and circumference**
* radius -> diameter
* diameter -> radius
* radius -> circumference
* circumference -> radius
* diameter -> circumference
* circumference -> diameter

**Area of a circle**
* radius -> area
* area -> radius
* diameter -> area
* area -> diameter
* circumference -> area
* area -> circumference