# math;)

posted by girly girl

Apollo 8 orbited the moon in a circular orbit. Its average altitude was 185 km above the moon's surface. Create an equation to model the path of Apollo 8 using the center of the moon as the origin. Note that the radius of the moon 1,737 km.
a. x^2+y^2=34,225
b. x^2+y^2=2,408,704
c. x^2+y^2=3,017,169
d. x^2+y^2=3,694,084

I am a little confused with this. Please help ;)

1. Bosnian

What is difficult here?

Equation of a circle:

x² + y² = r²

x² + y² = 1,737²

x² + y² = 3,017,169

Answer c.

2. Bosnian

Correction.

I forgot altitude.

R = r + 185 = 1,737 + 185 = 1,922

x² + y² = R²

x² + y² = 1,922²

x² + y² = 3,694,084

Answer d.

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