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alosnomolina1122
11.07.2019 •
Mathematics
Convert the equation r equals negative 14 cosine thetar=−14cosθ to cartesian coordinates. describe the resulting curve.
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Ответ:
Multiply the equation by r to get
... r² = -14·r·cos(θ)
Then make the usual substitutions:
x² +y² = r²
x = r·cos(θ)
This gives
... x² +y² = -14x
... x² +14x +49 +y² = 49 . . . . . add 49+14x
... (x +7)² + y² = 49 . . . . . . . . . equation of circle of radius 7 with center (-7, 0)
Ответ:
40 km
Step-by-step explanation:
Divide the distance by the scale
12/3 = 4
Multiply that number by the 10 km
4 x 10 = 40