A particle moves along the circumference of a circle of radius $R$. When it has described $90^{\circ

Question

A particle moves along the circumference of a circle of radius $R$. When it has described $90^{\circ}$, the displacement and distance travelled are\

Professor PC Thomas Classes · Answer

\ Displacement $=$ chord AB\ $=\sqrt{R^{2}+R^{2}}$\ Distance $=\mathrm{Arc} \mathrm{AB}$\ $=\frac{1}{4} 	imes 2 \pi \mathrm{R}$\