Question

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Answer 1

hi dear.
36 × 25 = 900sq.cm
then diameter of button = 3.5 cm
so their are will be
pie × r × r
22/7 × 1.75 × 1.75 = 9.62sq.cm
therefore go 56 buttons
area will be 9.62 × 56 = 539
hence area of remaining sheet will be
total area of sheet - total area of 56 buttons
so
900sq.cm - 539sq.cm = 361sq.cm
hence the area of remaining sheet will be approximately 361 sq.cm
I hope you get the correct ans.
THANK YOU.

Answer 2

Heya user,

Area of rectangle = Length * Bradth
=> Area of this Acrylic Sheet = 36 * 25 cm² = 900 cm²

Now, Area of 1 circular button = π ( 7 / 4 )² cm²
--------> Area of 56 circular buttons = ( 22 * 7 * 7 * 56 ) / ( 4 * 4 * 7 )
=> Area of 56 circular buttons = 60368 / 112 cm²
---> Area of 56 circular buttons = 539 cm²

=> Area of remaining sheet = Area of rectangle - Area of buttons 
=> Area of remaining sheet = 900 - 539 cm² = 361 cm²