Geometry Tutorials: How to calculate the surface area of a triangle
Two components are necessary to calculate the surface area of a triangle. The first is the pyramid's base width. The second is the pyramids height, to the distance from the base width, straight up at a rectangle towards the corner formed by the other two sides.
If you multiply the base width times the triangle's height you end up with the surface area of a rectangle. This may not sound like what we are after, but consider this: the rectangle is going to be exactly twice the size of the triangle.
This means that as soon as we divide the rectangle by two we are left with our desired triangle surface area. Here is the formula to make thing crystal clear:
a = bh ÷ 2
So, to summarize, a triangle's area can be calculated through multiplying the triangle's height times the base width and dividing the result by two. Do not forget to apply the square units of measurements to the result!