Correct Answer - Option 1 : the anchor point is inside the area being measured
(i) The areas between curved boundaries are also computed by planimeter from the map of the area. Most commonly used is Amsler polar Planimeter.
(ii) The formula for calculating areas of the map by using planimeter.
Area (A) = M × (FR – IR ± 10 N) + C
M = Multiplying constant
FR = Final reading of Planimeter
IR = Initial Reading
N = Number of times zero of dial pass is index mark
C = Constant marked above scale division on tracing arm (Constant C is used only when the anchor point is placed inside the plan)