The numerical length of RT is 9 units
How to determine the length of RT?
The given parameters are
ST = 15
SR = 6
RT = ??
Assume that the point R is on the line ST, then we have the following equation
ST = SR + RT
This gives
6 + RT = 15
Subtract 6 from both sides of the equation
RT = 9
Hence, the numerical length of RT is 9 units
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