Question 1048413
(i) {{{s = r*theta}}} ===> {{{s = 12*theta}}} ===> {{{ds/dt = 12*d(theta)/dt}}}  ===> {{{4 = 12*d(theta)/dt}}} ===>{{{d(theta)/dt = 1/3}}} rad/sec.


(ii) {{{A = (1/2)r^2*theta = (1/2)12^2*theta}}}

===> {{{dA/dt = 72*(d(theta)/dt)}}}

===> {{{dA/dt = 72/3 = 24}}} cm^2/sec.