1. First Row's Shaded Portion = 1 Square.
2. 2nd Row's 1st Square's+ 2nd Square's shaded portion = 1.5 Square.
3. 3rd Row's 1st Square's + 2nd Square's shaded portion = 1 Square
4. 2nd Row's 3rd Square + 3rd Row's 3rd Square's shaded portion = 1 Square
So total 4.5 Square are there which is 1/2 of total 9 Square
Hence, the Answer is : 1/2.