I Will do anything for the right answer PLEASE Given quadrilateral A(2,-1) B(1,3) C(6,5) D(7,1), i want to prove that it is a parallelogram by showing opposite sides are congruent. What formula would i use? How do i show that AB is congruent to CD.

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's

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