round the answers solve the triangles A = 42 degrees, B = 61 degrees, a = 12 i solved for the other 2, C and b, but for c on the answer sheet it says 17 but when solving with my calculator it gave me 18.31489... could I have made any errors or the answer sheet gave an error

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter7: Applying Fractions
Section7.8: Work Problems
Problem 12P
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round the answers

solve the triangles

A = 42 degrees, B = 61 degrees, a = 12

i solved for the other 2, C and b, but for c on the answer sheet it says 17 but when solving with my calculator it gave me 18.31489... could I have made any errors or the answer sheet gave an error

 

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i got those 2 already but I was looking the answer on lowercase c

the answer shown on my textbook for lowercase c says 17 but my calculator gave my 18.31489...

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