Understand Angled Trim Measurement

We're working on these trim pieces here and we've got two inside measurements. So, you could take your tape, you know, go like this, find the corner, but we're dealing with trim carpentry here. So, quick and dirty. I've got a piece cut to an angle here. Boom. To my long point, 10 in. My assistant over here has the same thing. Keep your piece there. You good right there? Mhm. Got 94. Add 20. 114.