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