Пусть AB = a, BC = b, тогда 10b = 8a => b = 0.8a
P = 2(a+b) = 2*1.8a = 3.6a = 84 => a = 70/3
S = 8 * 70/3 = 560/3
ответ: 560/3
Пусть AB = a, BC = b, тогда 10b = 8a => b = 0.8a
P = 2(a+b) = 2*1.8a = 3.6a = 84 => a = 70/3
S = 8 * 70/3 = 560/3
ответ: 560/3