Posted by donovan on Thursday, July 26, 2012 at 10:20pm.
A childrens play area is triangular. The sides of the play area measure 90m ,225m and 255m respectively . Calculate the area of the play area?

math  Henry, Friday, July 27, 2012 at 9:11pm
Use Law of Cosines to find one of the
sides:
a = 90 m.
b = 225 m.
c = 255 m.
CosB = (a^2+c^2b^2)/2ac
CosB=(8100+6502550625) / 45900=0.4902
B = 60.6 Deg.
Area = 0.5ac*sinB
Area = 0.5*90*255*sin60.6 = 10,000 m^2.

math  Henry, Friday, July 27, 2012 at 9:15pm
Correction: Used Law of cosines to find
one of the angles.

math  donovan, Friday, July 27, 2012 at 10:46pm
thanx
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