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Verified Answer :

check the slopes 
the first 2 points have slope (3-1) / (5-1) = 2/4  = 1/2
points 2 and 3 slope =  4/2 = 2
3 and 4:- slope = -2/-4 = 1/2
4 and 1:- slope =  4/2 = 2

so we have 2 pairs of opposite sides which are parallel

looks like a parallelogram or a rhombus 

if adjacent sides are equal its a rhombus

length betwee  pts 1 and 2  = sqrt(2^2 + 4^2) = sqrt20
 .. ...  ...   ..  ..   .. ...2 and 3 =  sqrt(4^2 + 2^2) = sqrt20

so it is a rhombus

Answer:

rhombus

Step-by-step explanation:

I took the quiz and got the question correct. Rhombus is the correct answer.