What is the value of h in a right angled triangle with 31° and 15cm?

What is the value of h in a right angled triangle with 31° and 15cm?
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Answer :

Following the symbols in the image:Assuming 15cm corresponds to a (the line adjacent to the angle), then you need to use the cosine formulacos(ø) = a/hcos(31º) = 15cm/hh*cos(31º) = (15cm/h) * hh*cos(31º) = 15cm * 1h*cos(31º)/cos(31º) = 15cm/cos(31º)h*1 = 15cm/cos(31º)h = 16.398
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