Region Measures (Length, Area, Volume, etc.) 

Count points.

In[1]:=

X RegionMeasure[Point[{{11}, {22}, {33}}]]

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Find curve length.

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X ArcLength[Circle[{x, y}, r]]

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Compute area.

In[3]:=

X Area[SASTriangle[a, A, b]]

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Compute surface area.

In[4]:=

X Area[Sphere[{0, 0, 0}, r]]

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Compute volume.

In[5]:=

X Volume[Cone[{{Subscript[x, 1], Subscript[y, 1], Subscript[z, 1]}, {Subscript[x, 2], Subscript[y, 2], Subscript[z, 2]}}, r]]

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Compute measures in any dimension.

In[6]:=

X RegionMeasure[Ball[{w, x, y, z}, r]]

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