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^2-b^2)/2ac

CosB=(8100+65025-50625) / 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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