Calculate the horizontal thrust for the two hinged semicircular arch loaded with point load at inclination of α with horizontal axis on the left span.

• A. \(\frac{W}{\pi}\)
• B. \(\frac{W}{\pi}\)sin2∞
• C. \(\frac{4RW}{3\pi}\)
• D. \(\frac{25WL}{128H}\)