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Mathematics 20 Online
OpenStudy (anonymous):

find m angle b, given a = 11, b = 12, and c = 17. A. 49.9 B. 40.1 C. 45.3 D. 44.7

OpenStudy (ddcamp):

Law of cosines: b² = a² + c² - 2*a*c*cos(m of angle b)

OpenStudy (anonymous):

i keep getting .9999. i don't know what im doing wrong?

OpenStudy (ddcamp):

144 = 121 + 289 - 374*cos(m of angle b) 0.71122994652 = cos(m of b) arccos(0.7112299...) = m of angle b 44.7 = m of angle b

OpenStudy (anonymous):

alright thank you

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