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2014-03-26T18:39:13+07:00
B = 15, c = 13
 r_{d} =  \frac{2.L}{K} \\   \\ 4= \frac{2.84 }{K}   \\ \\  K = 42
a = 42 - 15 - 13 = 14

L = \frac{1}{2}.a.b.sinC \\ \\ 84 = \frac{1}{2}14.15.sinC \\ \\ sinC = \frac{84}{7.15}
sinC =  \frac{t}{b} = \frac{84 }{7.15}

\frac{t}{15} = \frac{84 }{7.15}  \\ t = 12cm

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