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March 27, 2015

March 27, 2015

Posted by **Shane** on Monday, April 29, 2013 at 3:14pm.

- Maths -
**Henry**, Tuesday, April 30, 2013 at 4:21pmUse the law of cosines.

cosA = (-a^2+b^2+c^2)/2bc.

cosA=(-(8.6)^2+(9.1)^2+(9.7)^2)/176.54 =

0.58310.

A = 54.33o.

Area = 0.5*bc*sinA.

Area=0.5*9.1*9.7*sin(54.33) = 35.9 cm^2

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