math
posted by john .
Which set can not reprsent the lengths of the sides of a triangle?
a){4,5,6} 2){5,5,11) 3){7,7,12} 4){8,8,8}
The coordinates of Point R are (3,2) and the coordinates of point T are (4,1). What is the length of RT?

math 
Reiny
to have a triangle, the sum of any two of the sides must be greater than the third side.
so look at 5,5,11, is 5+5 > 11 ?
for the second, use your "distance between two points" formula.
http://www.purplemath.com/modules/distform.htm
look at the example half way down the page, it fits your problem exactly.
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