Find the area of the ellipse x2/a2+y2/b2=1x^2/a^2 + y^2/b^2 = 1x2/a2+y2/b2=1.
pir2\\pi r^2pir2
2piab2\\pi ab2piab
pi(a+b)\\pi (a+b)pi(a+b)
piab\\pi abpiab