Remember to keep your dimensions all the same (inches or feet).For a triangle such as the red example in our photo, just divide the triangle into two halves (green line) and you can still make these calculations with ease.For a right triangle, its Area = 1/2 x ( c x b ).For a rectangle just multiply the width and length of its two sides to obtain area.If you are working with hips and gables and you want to get precise area measurements you may find it easiest to divide the individual roof slopes up into sub-components: a rectangular part and a triangular part. Well this is only true provided the roof surface is a rectangle.RL is simply the building width plus the amount of overhang at the two gable ends of the building. RL = Roof Length = dimension of the roof from one gable end of the building to the other. Remember to include in (a) the amount by which the roof extends out over the building walls - its eaves. In my sketch I use (a) or the dimension of the sloping surface as RW. RW = Roof Width = dimension from ridge to eaves. tape measure you can extend the tape out to catch the roof eaves without having to walk dangerously close to the roof edge.
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