## 18 Review Problem - Volume of Stone Bridge

**Problem 18**

A stone bridge has three equal semicircular arches resting on four equal rectangular piers. The radius of each arch is R, the dimensions of the piers *L*, *W*, *H*, while the distance from the top of each pier to the top of the bridge is *D*. If *L* = 50 ft., *W* = 5 ft., *H* = 10 ft., *R* = 6 ft., *D* = 12 ft., find the number of cubic yards of material used in building the bridge.

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