Alright for all those who did not know, here is the answer,

i just figured it out

Answer:

P(the point lies in triangle MYN) = Area of triangle MYN / Area of the square WXYZ

Let the area of the triangle be: A

and let the area of the square be: B

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We all know that area of a triangle is 1/2 * base * height

Therefore, A = 1/2 * 1/2 * 1/2

= 1/8

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Now B,

B = Length * Height

Since M and N are the midpoint of ZNY and XMY:

B = (1/2 + 1/2) * (1/2 + 1/2)

= 1

Now: A/B = 1/8 / 1 = 1/8

Thank you, Plato