3.14 X 7.8" - 3.14 X 1.1" X 4
= 3.14 X ( 7.8" - 1.1" X 2" )
= 3.14 X ( 7.8" - 2.2" )
= 3.14 X ( 7.8 + 2.2 )( 7.8 - 2.2 )
= 3.14 X 10 X 5.6
= 3.14 X 7 X 8
= 21.98 X 8
= ( 22 - 0.02 ) X 8
= 176 - 0.16
= 175.84
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