Sergio 2.1
Оракул
(66259)
4 дня назад
Дано:
△ ABCD ∥ AD, BC
MK ⊥̸ AD, BC
M ∈ AB, K ∈ CD
ME = 7 см
EK = 9 см
Решение:
ME/EK = AD/BC
7/9 = AD/BC
AD = 7/9 × BC
MK = (AD + BC)/2
MK = (7/9×BC + BC)/2
MK = (16/9×BC)/2
MK = 8/9×BC
MK = ME + EK
16 = 7 + 9
8/9×BC = 16
BC = 16 × 9/8
BC = 18
AD = 7/9 × 18
AD = 14
Ответ:
AD = 14 см
BC = 18 см