Please solve question no.15.

Dear student, 
ABCD is a rectangle where AB=CD=6 cm
​AD=BC=3 cm
​​​​​​​O is the midpoint of AB,therefore, OA=OB=3 cm

So,coordinates of A will be O(0,0)+3 units in x'axis=(-3,0)

Similarly, coordinates of B will be B(3,0)
BC=3 cm
therefore,coordinates of C will be B(3,0)+3 units in y axis=(3,3)
Similarly, coordinates of D will be (-3,3)
Regards.

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