Pi pops up where you don’t expect it

Happy Pi Day, where we celebrate the world’s most famous number. The exact value of π=3.14159… has fascinated people since ...
Ars Technica

Photoshop: Making a circle with circumference 1px thick

I'm kind of confused by your question. Do you want a circle with a circumference of 1px or a circle with a 1px border?<BR><BR>The former sounds difficult, but for the latter, you can use the ...
YouTube on MSNOpinion

Find the length of a arc given the radius of a circle

Learn how to solve problems with arcs of a circle. An arc is a curve made by two points on the circumference of a circle. The ...
Opinion
YouTube on MSNOpinion

Learning how to find the measure of a minor arc for a circle

Learn how to solve problems with arcs of a circle. An arc is a curve made by two points on the circumference of a circle. The measure of an arc corresponds to the central angle made by the two radii ...
BBC

Higher – Calculating angles using circles

Circles have different angle properties, described by a number of theorems. This is one of two guides on circle theorems, with this guide covering the following: the angle subtended by an arc at the ...