mponcier4
01.08.2019 •
Mathematics
Question part points submissions used find a · b. |a| = 40, |b| = 90, the angle between a and b is 3π/4.
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Ответ:
1. formula is: a*b=|a||b|cos(ab);
2. a*b=40*60*cos135°=2400/√2 (≈1697,0563).
Ответ:
d=h/tanα
d1=1100/tan17.9
d2=1100/tan75.2
So the distance between them is:
d=d1-d2
d=1100/tan17.9-1100/tan75.2 meters
d≈3115.03 m (to nearest hundredth of a meter or centimeter)