In estimation, deduction for opening with semi-circular arch opening will be:
1
\(\left[ {\left( {l \times h} \right) + \left( {\frac{3}{4} \times l \times r} \right)} \right]\) × thickness of wall
2
\(\left[ {\left( {l \times h} \right) + \left( {\frac{2}{3} \times l \times r} \right)} \right]\) × thickness of wall
3
\(\left[ {\left( {l \times h} \right) + \left( {\frac{5}{3} \times l \times r} \right)} \right]\) × thickness of wall
4
\(\left[ {\left( {l \times h} \right) + \left( {\frac{5}{4} \times l \times r} \right)} \right]\) × thickness of wall