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surface area=5544

4x22/7xrxr=5544

rxr=5544x7/22x1/4

rxr=441

r=21 cm(square root on both sides)

diameter=2r

=2x21

=42 cm

4

= r square = 5544×7/4×22

=r=21

since diameter =2r = 2x21

: . there fore diameter = 42 cm.