00:01
Okay, this one says, what is the area in square feet of the triangular face of the solid? so if we're wanting the triangular face of the solid, we're just calculating this guy right here.
00:10
Okay, let's go ahead and draw that out a little bit bigger.
00:13
So here we have 10, 10, and 16.
00:16
So we know that the area of a triangle is just one half base times height.
00:24
But currently, we know our base, but we don't actually know our height.
00:29
So in order to get the height, we're going to do a little bit of trigonometry.
00:33
So we're going to go in and draw this line down here because that's going to make a right triangle.
00:37
If we're dividing it down here and this side is 10 and this side is 10, so we know that these are equal, then we know that the divided parts are also going to be equal.
00:46
So then since we're dividing 16 equally, it's going to be 8 and 8...