A CYLINDER OF HEIGHT 12 CM AND RAIDUS 5CM IS MADE UP OF CARDBOARD USE THE VALUE OF 3.1 FOR PIE TO CALCULATE THE TOTAL AREA OF CARDBOARD NEEDED TO MAKE A CLOSED CYLINDER ,A CYLINDER OPENED AT ONE END.

Answer 1

PI, not PIE!
a = πr^2 + 2πrh
so plug in your numbers.

Answer 2

answer