Attempt to post a math page

Using MS Word and its equation editor didn't work. Might have to learn more HTML. I'd like know which browsers can render:

A = &pi r2
A = &pi r²
Third try:
‌A‌ = πr^2
nC_r = ^n! _(r!(n-r)!)
ⁿC_r = n! / (r!(n-r)!)
¦ A ¦ = πr²
and
çA÷ = pr2

The first of these is, "The absolute value of A equal pi r squared." The second is, "c cedilla A divisionSymbol = p r squared."

Please let me know. I can check Firefox and IE. If you use another browser please let me know what the equations look like.

Very complex HTML copied from a math web page:

Example 1. How many combinations are there of 5 things taken 4 at a time?

Solution. 5C4 =

5· 4· 3· 2 1· 2· 3· 4

= 5

Using a rowspan'd table:

Combinations of Five Things taken Four at a Time

5C4 =	5 * 4 * 3 * 2 * 1	= 5
	4 * 3 * 2 * 1