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If the cosin of an acute angle is .80, what is the cosin of half of that angle?

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If the cosin of an acute angel is .80, what is the cosin of half of that angle?

acute-angle
cosin-angle

asked Mar 4, 2014 in GEOMETRY by homeworkhelp Mentor

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1 Answer

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cos Ѳ = 0.8

cos Ѳ/2 = sqrt((1+cos Ѳ)/2)

Substitute 0.8 for cos Ѳ

=sqrt((1+0.8)/2)

=sqrt 0.9

answered Apr 23, 2014 by bradely Mentor

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