Find the area of a triangle with sides of 66.9 and 78.9 centimete_数学解答

Find the area of a triangle with sides of 66.9 and 78.9 centimeters,and the included angle of 37.9

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解答

求两边分别为66.9和78.9cm,且夹角为37.9°的三角形面积
S=absinC/2=1621.22平方厘米（square centimetres）