0.13m is equal to 13cm. So between the 12cm and the 14cm segments :)
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Depending on the size of it id say either a 15cm ruler or a 30cm ruler.
A normal ruler from England measures 30cm and 12inches, or 15cm and 5 inches depending on how big you want it.
15cm = 5.9 inches.
65.6 centimeters.
Following the symbols in the image: Assuming 15cm corresponds to a (the line adjacent to the angle), then you need to use the cosine formula cos(ø) = a/h cos(31º) = 15cm/h h*cos(31º) = (15cm/h) * h h*cos(31º) = 15cm * 1 h*cos(31º)/cos(31º) = 15cm/cos(31º) h*1 = 15cm/cos(31º) h = 16.398