Asif, Thanks for another nice problem.
I think the description would be improved if it said the "red shaded portion", because there are two shaded portions in the drawing.
vectorization in N
Similar Triangles - find the height of the tree
Length of a short side
The last non-zero digit of a factorial
Sieve of Eratosthenes - 02
Count the days
Hanging cable - 01
find nth even fibonacci number
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