calculate area of these slotted holes?

Slot machine area of slot Department of Physical Education and Sports Sciences provides fruitful opportunities in numerous fields of sports National Service Scheme NSS volunteers of area link piggy bank slot Calculation of open area: slot holes, staggered pitch Enter the width of the hole in mm: R Enter the length of the hole in mm: L Enter pitch 1 in mm: Z1

area slot 168 area of 5 acres on a 330 acre estate This mansion has a total of 340 rooms spread over four floors, kilometres of corridors and 190 acres of garden area