anonymous
  • anonymous
The center of a circle with a radius of three units is (1,1). Which of these points is on the circle? A. (4,4) B. (-2,1) C. (-4,1) D. (3,0)
Mathematics
jamiebookeater
  • jamiebookeater
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Hero
  • Hero
Plot all the points on an xy plane or use the distance formula. Whichever point is a distance of 3 units from 1,1 is the correction solution.
anonymous
  • anonymous
so A????
Hero
  • Hero
wait a sec. Let me do it

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Hero
  • Hero
That's not 3 distance units. Did you use the distance formula?
Hero
  • Hero
It's B
anonymous
  • anonymous
well...plotting all the point and visualize everything will give you a feeling for the solution but the real way to do it is with the distance formula...which i cant recall...but A is a trap!
Hero
  • Hero
Actually hat, the quickest way is to plot the points on an xy plane. That's why I know the answer is B
anonymous
  • anonymous
yes i would go with B as well...just a huntch
Hero
  • Hero
Distance Formula takes longer, thats why I suggested plotting on xy plane first.
anonymous
  • anonymous
distance formula takes longer but if u dont have designing tools around you distance formula can be a lot faster
mathmate
  • mathmate
Also check visually points that line up with the centre, like (*,1), or (1,*). The distance formula reduces to the difference. B is such a case. However, we don't always get lucky this way.
Hero
  • Hero
I don't consider graph paper a "designing tool"
Hero
  • Hero
By default, if you're taking a math class, you should have graph paper handy

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