anonymous
  • anonymous
what is the perimeter of triangle ABC with vertices A(-2,9), B(7,-3), and C(-2,-3) in the coordinate plane
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
a) 21 units b) 15 units c) 34 units d) 36 units
anonymous
  • anonymous
Use the distance formula to find the length of each vertex
anonymous
  • anonymous
I don't know how

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anonymous
  • anonymous
distance between (a,b), (c,d): sqrt( (a-c)^2 + (b-d)^2 )
anonymous
  • anonymous
for example, distance between A(-2, 9) and B(7, -3): sqrt( (-2-7)^2 + (9-(-3))^2 ) = sqrt( 81 + 144) =sqrt( 225) = 15
anonymous
  • anonymous
do that for vertices BC and AC, then add all of them together

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