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Use of cosinus for calculation of a triangle
Hello,
I'm having a problem getting excel to calculate the angles of a triangle. I know the formula for calculating angle C for instance (knowing lengths of all three sides) cosinus^-1 of (a^2+b^2-c^2)/(2*a*b) But how do I put this into excel? When I put it in as following: COS^1((a^2+b^2-c^2)/(2*a*b)) It dosn't work. Can anybody help me? Thanks |
#2
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Use of cosinus for calculation of a triangle
Whuggy,
With a in A2, b in B2, and c in C2, the value of C in degrees is =ACOS((A2^2+B2^2-C2^2)/(2*A2*B2))*180/(PI()) and in radians is =ACOS((A2^2+B2^2-C2^2)/(2*A2*B2)) HTH, Bernie MS Excel MVP "Whuggy" wrote in message ... Hello, I'm having a problem getting excel to calculate the angles of a triangle. I know the formula for calculating angle C for instance (knowing lengths of all three sides) cosinus^-1 of (a^2+b^2-c^2)/(2*a*b) But how do I put this into excel? When I put it in as following: COS^1((a^2+b^2-c^2)/(2*a*b)) It dosn't work. Can anybody help me? Thanks |
#3
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Use of cosinus for calculation of a triangle
The result will be in radians - there are 2 x pi radians in 360
degrees. Hope this helps. Pete On Apr 23, 3:07*pm, Whuggy wrote: Hello, I'm having a problem getting excel to calculate the angles of a triangle. I know the formula for calculating angle C for instance (knowing lengths of all three sides) cosinus^-1 of (a^2+b^2-c^2)/(2*a*b) But how do I put this into excel? When I put it in as following: COS^1((a^2+b^2-c^2)/(2*a*b)) * It dosn't work. Can anybody help me? Thanks |
#4
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Use of cosinus for calculation of a triangle
Thanks a lot for the answer. Just what I needed!
"Bernie Deitrick" wrote: Whuggy, With a in A2, b in B2, and c in C2, the value of C in degrees is =ACOS((A2^2+B2^2-C2^2)/(2*A2*B2))*180/(PI()) and in radians is =ACOS((A2^2+B2^2-C2^2)/(2*A2*B2)) HTH, Bernie MS Excel MVP "Whuggy" wrote in message ... Hello, I'm having a problem getting excel to calculate the angles of a triangle. I know the formula for calculating angle C for instance (knowing lengths of all three sides) cosinus^-1 of (a^2+b^2-c^2)/(2*a*b) But how do I put this into excel? When I put it in as following: COS^1((a^2+b^2-c^2)/(2*a*b)) It dosn't work. Can anybody help me? Thanks |
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