Question

4. ABC үшбурыш ынын ауданы \( S=14 \mathrm{~cm}^{2}, \mathrm{AC}=\mathrm{b}=8 \mathrm{cм}, \mathrm{BC}=\mathrm{a}=7 \mathrm{cм} \) болса,онда \( \angle \mathrm{C} \) ын табындар. [3]

Ask by Osborne Whittaker. in Kazakhstan
Feb 27,2025

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Угол \( \angle C \) равен \( 30^\circ \).

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Ушбурыштын ауданын табуу формуласы \( S = \frac{1}{2}ab\sin{C} \) түрүндө берилет. Бул формула боюнча, сизге \( S = 14 \, \text{cm}^2 \), \( a = 7 \, \text{cm} \) (BC), жана \( b = 8 \, \text{cm} \) (AC) берилип, \( \angle C \) табуу керек. Сизден \( \sin{C} \) маанисин алуу үчүн формуланы кайра жазсаңыз: \[ 14 = \frac{1}{2} \cdot 7 \cdot 8 \cdot \sin{C} \] Ошондуктан, \[ 14 = 28 \cdot \sin{C} \implies \sin{C} = \frac{14}{28} = \frac{1}{2}. \] Анан, \( \sin{C} = \frac{1}{2} \) болгондо, \( \angle C = 30^\circ \) же \( 150^\circ \) болушу мүмкүн. Бирок үч бурчтукта көбүнчө \( \angle C \) бул болсо, б.а. \( 30^\circ \). Ошентип, жооп: \( \angle C = 30^\circ \).

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