Answer :
While walking from one corner to the opposite corner in a straight line, the bug visits 19 tiles including the first and the last tile.
What exactly is a rectangle?
A rectangle is a four-right-angle quadrilateral. A rectangle is a four-right-angle quadrilateral.. Because all of its angles are equal (360°/4 = 90°), it is also known as an equiangular quadrilateral or a parallelogram with a right angle. A non-square rectangle is sometimes referred to as an oblong.
A rectangle is a rectilinear polygon, meaning its sides intersect at right angles.
Five independent degrees of freedom define a rectangle in the plane.
The bug visits 1 tile multiplied by the number of times it crosses a horizontal or vertical line.
It has to cross nine horizontal and nine vertical lines. That bug must pay a visit.
9+9+1=19 tiles
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