Предмет: Математика, автор: annashipilova1

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Автор ответа: diar2

9.
$cosB= frac{BH}{AB}=frac{BH}{BC}=frac{BH}{BH+CH}=frac{12}{12+3}=frac{12}{15}=frac{4}{5}=0.8$

10. $S=a^2$
Очевидно, что сторона квадрата равна диагонали вписанной окружности
$a=D=2R=2*4=8\ S=8^2=64$

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