SOLUTION: What is the perimeter of PQR with vertices P(–2, 9), Q(7, –3), and R(–2, –3) in the coordinate plane? I used the Distance Formula and I get 18 units. What am I doing wrong???

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Question 647869: What is the perimeter of PQR with vertices P(–2, 9), Q(7, –3), and R(–2, –3) in the coordinate plane?
I used the Distance Formula and I get 18 units. What am I doing wrong???
Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!

PQR with vertices P(–2, 9), Q(7, –3), and R(–2, –3)
first distance P(–2, 9), Q(7, –3)
Solved by pluggable solver: Distance Formula to determine length on coordinate plane
The distance (d) between two points is given by the following formula:



Thus in our case, the required distance is



For more on this concept, refer to Distance formula.


so, ....one side of PQR


second distance P(–2, 9), R(–2, –3)
Solved by pluggable solver: Distance Formula to determine length on coordinate plane
The distance (d) between two points is given by the following formula:



Thus in our case, the required distance is



For more on this concept, refer to Distance formula.


....second side of PQR


third distance Q(7, –3), R(–2, –3)
Solved by pluggable solver: Distance Formula to determine length on coordinate plane
The distance (d) between two points is given by the following formula:



Thus in our case, the required distance is



For more on this concept, refer to Distance formula.


....third side of PQR

now you are ready to find the perimeter



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