Toán 12 Hình nón

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saobuon38

goi hinh chop la ABCD
ban tim tam O cua duong tron ngoai tiep tam giac BCD
suy ra ban kinh day R=OB=OC=OD
vi day la chop deu nen ta de dang tinh duoc duong cao AO
vi hinh chop noi tiep hinh non suy ra duong cao hinh chop bang duong cao hinh non,ban kinh day bang R
ban ap dung vao cong thuc roi tinh tiep nhe.
chuc ban thanh cong
 
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