in triangle pqr , the angle q = 90 degree , pq = 4 cm , qr = 8 cm . x is a variable point on pq . the line through x parallel to qr , intersects pr at y and the line through y , parallel to pq , intersects qr at z . find the least possible length of xz
n0 = 90.0
n1 = 4.0
n2 = 8.0
t0 = n1 * n2
answer = t0 / 10.0
print(answer)