# What angles does this triangle have?

Hi,

I have a 90 degree triangle with the following sides:

Side A: 65"
Side B: 156"
Side C (hypotenuse): 169"

How can I get the angle between Side A and the Hypotenuse?
LVL 11
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Senior Infrastructure Support Analyst & Systems DeveloperCommented:
angle = sin inverse (opposite side / hypotenuse)
sin inverse (156 / 169)
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This should be the arc cosine of a divided by c, or at least that is what the great Google led me to believe.
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Commented:
yes, or arcsin of b divided by the hypotenuse, or arctan of b divided by a
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Commented:
Homework question? I ask because all the lengths are multiples of 13. In fact the tangent of the required angle is 5/12
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Author Commented:
Thanks.  I was using the sinh function in Windows calculator.  That's NOT what I needed.
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