Given P, Q, R, S and A, B, C, D as midpoints of bigger square and smaller square respectively, if on joining these midpoints, if 8 trapeziums are formed as above, then find the perimeter any one of the trapezium?

Given P, Q, R, S and A, B, C, D as midpoints of bigger square and smaller square respectively, if on joining these midpoints, if 8 trapeziums are formed as above, then find the perimeter any one of the trapezium?