Як знайти площу трикутника, якщо а=11, б=5, с=7?
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S = V ( P * ( P - A)*(P - B)*(P - C) )
P = 0.5*( A + B + C) = 0.5 * ( 11 + 5 + 7) = 0.5 * 23 = 11.5
S = V ( 11.5 * ( 11.5 - 11)*(11.5 - 5)*(11.5 - 7) ) =
= V ( 11.5 * 0.5 * 6.5 * 4.5) = V 168.1875 = 12.93 (округляем до 13 )
Ответ 13