According to Westgard the equivalent radius for the resistance of section b is given as b = _______. where 'a' is the radius of wheel load distribution and 'h' is the thickness of the slab.
1
\(\sqrt{1.6a^2+h^2}-0.675h\) When a < 1.724 'h'
2
\(\sqrt{1.6a^2+h^2}-0.675h\) When a > 1.724 'h'
3
\(\sqrt{1.6a^2+h^2}-0.625h\) When a < 1.724 'h'
4
\(\sqrt{1.6a^2+h^2}-0.625h\) When a > 1.724 'h'