斜高=√﹙5²-[﹙14-8﹚/2]²﹚=4 侧面积=4×[﹙14+8﹚/2]×4=176﹙cm²﹚
高=√﹙5²-[﹙14√2-8√2﹚/2]²﹚=√7 体积=√7﹙196+64+112﹚/3=124√7﹙cm³﹚