Shoelace formula for polygonal area: Difference between revisions
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30.0
>>> </lang>
Or, defined in terms of '''reduce''' and '''cycle''':
Line 924 ⟶ 925:
'''Area of polygon with vertices
at (x, y) points in xys.'''
def go(a, tpl):
(x, y), (dx, dy) = tpl▼
l, r = a
▲ (x, y), (dx, dy) = tpl
return (l + x * dy, r + y * dx)
(nl, nr) = reduce(
go,
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