I need to first apologize to all of my photography followers, but I love design as well, so I had to share!
Step 1: Paint the base coat. Let this dry overnight. Since you will be taping over the paint, you want to make sure it is really dry.
Step 2: Measure the width of your wall. Based on the width, figure out how wide to make each of the lines of the triangle. I am very much a perfectionist, so I wanted a full line on each side. I chose 16″ for the sides and 11″ high to the point. The height needs to be divisible as well by the height of the wall. Here is an example, if your wall is 100″ wide, 10″ sides would be perfect, but 7″ would not be.
Step 3: Using a tape measure, start at the top of the wall and start measuring. Use a pencil and make dots at all of the points.
Step 4: Using painters tape, connect the points with tape. The most important part of this step is that the line must be inside the dots on one side and outside on the other. This will make sense when you start doing it. To ensure they are even spaces the tape can not cover the area you will be painting. Use scissors to make sure you have a clean line at the points that will be inside the painted area. Do not worry about the side that will not be painted.
Step 5: This is an important step that many people skip! Seal the tape! Paint your base color over the tape of the area that is going to be painted the other color. This is to seal the line; so, if it seeps through underneath the tape, it will be the base color and not the other color. This is how to get a perfect edge (same can be done with painting stripes).
Step 6: Put small pieces of tape in the sections that are not being painted. When it looks crazy with all the lines, sometimes mistakes can happen and this helps to prevent painting in the wrong areas.
Step 7: Paint your color with two coats. Peel the tape before the second coat is dry. This prevents any peeling of the dry paint.
Step 8: Take a step back and enjoy your masterpiece! My before, during, and after shots are below.