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geom3d[area] - compute the area of a triangle, or the surface area of a sphere or a regular polyhedron
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Calling Sequence
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area(obj)
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Parameters
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obj
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triangle, sphere, or regular polyhedron
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Description
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The routine area returns the area or surface area of the input object which is a triangle, a sphere, or a regular polyhedron.
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The command with(geom3d,area) allows the use of the abbreviated form of this command.
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Examples
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Define triangle ABC with vertices A, B and C
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![triangle(ABC, [point(A, 0, 0, 0), point(B, 2, 0, 0), point(C, 1, 3, 0)])](/support/helpjp/helpview.aspx?si=5937/file03997/math53.png)
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Find the area of ABC
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Define an icosahedron with center o(1,2,5) and the radius of the circum-sphere is 1
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Find the surface area of ico
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![draw(ico, style = patch, lightmodel = light4, orientation = [-136, 56], title = 'icosahedron')](/support/helpjp/helpview.aspx?si=5937/file03997/math84.png)
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