There are 3 shapes on a 10x10 grid. Which shape is closest to the pink right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: pink right_triangle at (8, 0)
Distance from target shape to cyan square at (2, 2): 8
Distance from target shape to gray trapezoid at (8, 4): 4
Closest shape is the gray trapezoid at (8, 4) with distance 4</think>

<answer>(8, 4)</answer>