A technician often has to sketch or design ductwork and the other parts of an HVAC system. Sometimes you have to sketch the room or building you are working with. This means working with lines, angles ...

Learn the essential definitions of the parts of a circle. A secant line to a circle is a line that crosses exactly two points on the circle while a tangent line to a circle is a line that touches ...

“Why are there 360 degrees in a circle?” A regular reader recently asked me that question. My first response was to say “Because Miss Helland told me so.” Miss Helland was my high school teacher for ...

The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown. To do ...

Revise the different types of angles and rules for calculating angles. This guide includes interactive activities and a quiz. NEW: Angles in parallel lines Revise alternate, correspondent or ...

It’s 10 a.m. on a Saturday at Cal State Fullerton and students are revved up. It’s Math Circle time. Math Circle is a Saturday program for students in second through 12th grade, most of whom are ...