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Three sides of a trapezium are each equ...

Three sides of a trapezium are each equal to 6 cm. Let `a in (0,pi/2)` be the angle beetween a part of adjacent sides.
If the area of the trapezium is maximum, what is the length of the fourth side?

A

A)8 cm

B

B)9 cm

C

C)10 cm

D

D)12 cm

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The correct Answer is:
D
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