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Dogy126
@Dogy126
June 2022
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Только номер 5 помогите
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evstifeeva07
В Δ СDB sin ∠ DBC = CD/BC
sin∠DBC = 10/25=2/5
В Δ ABE sin ∠ABE = AE/AB
∠dbc=∠abe, значит
2/5=AE/35; 70=5AE AE=14
S = 1/2 *AB*CD = 1/2*35*10=350/2 = 175
ответ: S = 175 см²
высота AE=14 см
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Answers & Comments
sin∠DBC = 10/25=2/5
В Δ ABE sin ∠ABE = AE/AB
∠dbc=∠abe, значит
2/5=AE/35; 70=5AE AE=14
S = 1/2 *AB*CD = 1/2*35*10=350/2 = 175
ответ: S = 175 см²
высота AE=14 см