which is the center of rotation of a semi-circle

Question

i want to know which is the semi circle center of rotation if any one can help me plsssssssssssssssssssss....

Answer 1

depend on wot yu wanna rotate bout

if base is along x-axis, draw vertikal line thru point yuzed as

senter av the serkel.

yu kan spin the shape round vertikal line thru this senter

If yu want dif direkshun, need tu find the mass senter

or senter av area av semiserkel.  yuno it will be on the vertikal line thru senter

av serkel.  But how hi up from senter??? That require kalkulus.

Answer 2

semiserkel mass senter is up 0.42441318*radius

up from base=up from x-axis