A spear is not the most appropriate tool with which to find an area.
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to find the surface area you have to first find the area of each part then add the areas together.
to find the surface area of the triangle we just need to multiply the length with breath. area=lengthXbreadth
You will need to find the surface area of each face and add them together.
You find the surface area of each of its six faces and add them together.
If you know how to find the area of all the shapes of the faces of the net, add the area of them together to get the surface area.