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So it's okay to have an altitude that is not inside your triangle. If I look at the other two altitudes in this obtuse triangles, we're going to have one altitude going like that I'm going to have to extend that side as well and we'll drop down another altitude. Notice that I had to extend that opposite side. Altitude is the elevation of an object from a known level or datum. So if we pick this vertex, our opposite sides are over here but that opposite side doesn't continue to where this altitude will drop. So a third case is the obtuse triangle, and here is where I say to a line containing the opposite side. A CRS defines the translation between a location on the round earth and that same location, on a flattened, 2 dimensional coordinate system.

The CRS also defines the the coordinate system itself. However if I pick my 90 degree angle as my vertex, then we'll be able to see that altitude inside the triangle. The components of the CRS define how the flattening of data that exists in a 3-D globe space. If I pick this vertex right here the altitude will just be that leg of the triangle. That's going to be that leg of the triangle. If we look at a right triangle over here we can see that if I pick this vertex right here, we already have an altitude drawn. Notice that all three altitudes are inside the triangle. We would have two more altitudes, each of which would go perpendicular to the opposite side. O que é (definição geográfica) Altitude é uma elevação vertical ou distância vertical de um ponto da superfície terrestre em relação ao nível do mar (nível zero).

So if I were to pick this top vertex right here, the altitude would go straight down perpendicular to the opposite side.

So if we look at an acute triangle, there are going to be three altitudes, one form each vertex. It's not always to the opposite side and you're going to see why in a second here. So this definition is written very carefully. What we're talking about is a perpendicular segment, remember this symbol right here means perpendicular-I'm trying to get you used to seeing these symbols-from a vertex to a line containing the opposite side. Altitude of a geometric figure is the shortest distance from its top vertex to its opposite side base. When we're talking about triangles, there's a special segment three in each triangle called an "Altitude." So we're not talking about skiing here.