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melissareid65
19.06.2020 •
Mathematics
Name two red lines in the diagram that appear to be perpendicular.
A. ST and SP
B. PQ and SR
C. PQ and UT
D. No red lines are perpendicular.
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Ответ:
Let's assume CD=h, BD=x.
tan 24°=h/x ==>h=x*tan 24°
tan 16°=h/(7600+x)==>h=tan 16° *(7600+x)
==>x tan 24°=tan 16°*(7600+x)
==>x=(7600*tan 16°)/(tan 24°-tan 16°)
h=x*tan 24= (7600*tan 16°*tan 24°)/(tan 24°-tan16°)
b) CD=h=6122,2303...≈6122 (feet)
a) BC=h/sin 24°=15052,0746448...≈15052 (feet)
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