area of a polygon is p*a/2.
where, p is the perimeter and
a is the apothem i.e. the normal distance from center to any of the sides of the polygon.
Distance walked 2D
Calculate the height of an object dropped from the sky
Is the input divisible by 3?
Remove All elements less than 5
Rotate a matrix without using rot90
Queen's move - 02
find subscripts from linear index
check whether a number is a pentatope number
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