You can measure a corner TV stand using the following steps, 1. Measure the distance using a tape from the corner to the final obstacle on one side of the wall. (window or door opening) 2. Repeat the measurement process with the intersecting wall. 3. Use Pythagorean theorem to check whether the square root of the two wall measurements is larger than the square root measurement of the TV. 4. Use the measurements of the two walls as A and B. Find the square root of A2 + B2. Your TV must be smaller than this number.