15. Find value of x and y in the following figures.
(a) If ABCD is a parallelogram.
A
D
Sut 1
2(x+1)
3x-1
by-l
B
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Answer:
Quadrilateral CDEF is a parallelogram when x = 4. If one pair of opposite sides of a quadrilateral are congruent and parallel, then the quadrilateral is a parallelogram.
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