Math symbols?

How do I put math symbols on my questions like this? As the sigma symbols, square roots, etc. Do I need a program?

You can copy and paste from MS Word. Or you can type σ = & sigma; (without spaces) = θ & Theta; & Σ = sum, etc.

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Math in Our Lives: Numbers $54.95 Numbers explores how numbers are used in our lives to count, identify, and name. The program shows how numbers are used as representative symbols, and also illustrates some of the different and creative ways we use numbers to convey information in our everyday lives, such as through telephones, clocks, and addresses. Part of "Math in Our Lives," an innovative nine-program series that uses pract...

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