Planimeters
Dq = 0
A = l s
From before: AR-AL = l s - 1/2 l l2 Dq
To measure a region, have the left end of the
planimeter follow a path that encloses no area.
AL
= 0
AR
= A, desired area
A = l s - 1/2 l l2 Dq
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Polar and Linear
Planimeters Dq = 0 A = l s |