Can somebody please explain me the following point:

If a planar region formed by a figure T is made up of two non overlapping planar regions formed by figures P and Q ,then ar(P)+ar(Q),where ar(X) denotes the area of figure X

Thank you

Consider the following examples:1. Consider a gm ABCD in which diagonal AC is joined.


argm ABCD = arABC + arADCHere the triangular regions ABC and ADC are non overlapping.


2.Consider a ABC, in which AD is median to BC.



arABC = arADC + arADBHere ADC and ADB are non overlapping regions.

 

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