Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = 9 sin(x), y = 9 cos(x), 0 ≤ x ≤ /4; about y = −1

mhvkyckycj,b.ibu.bi.BOhi.b.uvu,v,hc,uc,hvymctd6id7tp8y

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two