Then 



THE CENTROID 



49-72 



15-92 

 = 8-123 



Taking horizontal strips each of breadth 8t/, 



Moment of strip = (4 x}y St/ 



rii 

 Total moment of area PQR = I (4 x}y dy 



<* 5 



rti M 



= 41 y dy na 2 \ ar n ax 

 h J2 



2n+l 



M 



FIG. 56, 



3-274 

 = 192 - 150-7 

 = 41-3 



Moment of rectangle PRMN = 25 

 For the whole area, 



Total moment = 41-8 + 25 = 66-3. 

 66-3 



Then 



Or by taking vertical strips, 



15-92 

 4-164 



217 



Moment of strip = - y 2 



