Question

and drain cover is made from a square metal plate of 5:40 p.m. having 441 rules of diameter 9 cm is in it find area of the remaining Square Plate

Answer 1

$<marquee>☺☺Hi there☺☺</marquee>$

area of drain= 40 x 40
                   =1600cm​2
area of 1 hole= 22/7 x R x R
                   = 22/7 x 1/2 x 1/2
                  =11/14cm​2

area of 441 holes= 11/14 x 441
                          =4851/14
                         346.36cm2

area of the remaining portion =area of drain - area of 441 holes

                                        =1600-346.36
                                          =1253.64cm2

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