21. In the given figure, ABCD is a parallelogram. X is the midpoint of AB. If produced CX intersects produced DA at Y, then prove that AYBC is a parallelogram.
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Step-by-step explanation:
so now ABCD is a parallelogram so ZA = ZC= y deg (opp angles of ||gm are equal)
so ZCBA = 180 - y (as adjacent angles of ||gm sum up to 180)
and AC is a diagonal and diagonals of || gm
and it bisects both ZA and ZC
so ZCAX = y/2
now AD || BC
and AD produces to Y
so AY || BC
ZCBA= ZXAY= 180 - y
similarly
ZCAX = ZXBY = y/2
now in triangle ABC and in triangle BAY
ZXAY = ZCBX
ZCAX = ZXBY
AX = XB
so both of triangles are congruent
now
AYB = ACB
AC = BY
AY = BC
by CPCT
now
AYBC Follows all the properties of parallelogram
• opposite angle are equal
• opposite sides are equal and parallel
• Diagonal bisects each other
• sum of angles are 360 deg .
hence proved
hope it'll help you.
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