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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
15cm in width and 10 cm in length
5.90551 inches