Based on the answers provided, the following corrections are needed:

1. The object needs to be reshaped to have a triangular form. Currently, it is a polyhedron with multiple faces. It should be modified to have a single triangular face.

2. The triangle should be designed as an isosceles triangle. This means two sides of the triangle should be of equal length. 

3. The two angles with the base of the triangle should be adjusted to be close to 90 degrees. This will make the triangle a right-angled isosceles triangle.

Please note that the object should remain a 3D object, as it is correctly extruded in one dimension.