Based on the answers provided, the following corrections need to be made to the 3D object:

1. Modify the center triangle to be an equilateral triangle. This means all sides should be of equal length and all angles should be 60 degrees.

2. Ensure that the triangles on the sides are acute-angled scalene triangles. This means all sides should be of different lengths and all angles should be less than 90 degrees. Please provide clear images to confirm this change.