small bathrooms. i have kind of a similar fear, but I'm really only scared of small bathrooms, or monochromatic ones or ones with labels and directions as to what to do (like airplane or cruise ship bathrooms) I hate flying because of my fear, and always avoid airplane bathrooms.
A rectangular prism is solid 3-dimensional object which has six  faces that are rectangles. It has 12 edges and 8 vertices.
To find the surface area of a rectangular prism, firstly find the area of each side of the rectangular prism. Rectangular prism have six surface area, but there are three sets of two equal areas. The top and bottom, the left side and right side and the front and back will be the same.