K
Khách
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NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
2 tháng 8
Khi đi bộ trên đường có vỉa hè, để đúng quy tắc an toàn giao thông, em cần đi bộ trên vỉa hè.
NK
2
15 giờ trước (10:49)
-> What was the weather like? ( Thời tiết hnay ntn? )
AA
4
PH
2
BC
2 tháng 8
Không biết, chỉ biết người phát minh ra đầu nhiệt kế là Daniel Gabriel Fahrenheit thôi =)
\(BC^{2}=AB^{2}+AC^{2}\)
\(\Rightarrow 5^{2}=3^{2}+AC^{2}\Rightarrow AC^{2}=25-9=16\Rightarrow AC=4\text{\ (cm)}\)
\(\sin B=\frac{AC}{BC}=\frac{4}{5}=0,8\)
\(\Rightarrow \widehat{B}\approx 53,1^{\circ }\text{\ (làm\ tròn\ đn\ ch\ s\ thp\ phân\ th\ nht)}\)
b) Chứng minh hình học
\(AB^{2}=BH\cdot BC\Rightarrow BK^{2}=BH\cdot BC\Rightarrow \frac{BH}{BK}=\frac{BK}{BC}\)
\(\Rightarrow \triangle BHK\sim \triangle BKC\text{\ (c-g-c)}\)
\(\frac{KH}{KC}=\frac{AH}{AC}\)
\(\sin C=\frac{AH}{AC}\Rightarrow \sin \widehat{BAH}=\frac{AH}{AC}\)
\(\frac{KH}{KC}=\sin \widehat{BAH}\Rightarrow KH=KC\cdot \sin \widehat{BAH}\text{\ (đpcm)}\)
c) Chứng minh \(CM \perp MP\)
\(\widehat{CMP}=90^{\circ }\)
\(\Rightarrow CM\perp MP\text{\ (đpcm)}\)
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(Cấu trúc: remind sb to-V)413. The pharmacist advised me to get that persistent cough checked by a specialist.
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