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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

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Marcus Rivera

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4y ago

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