Q1) A of circle = pi.r^2
the graph is a semi circle x-int at x=2,-2
thus, A in 1st quad=a quater of a full circle
A=pi.2^2 /0.24
Q2)An alt. method.
Since the limits are at a & -a therefore the integral of an odd function with limits a and -a is 0
also the integral of an even...