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INTERSECTING RECTANGULAR PRISMS
99
| Surface area of entire ring 36.128″×20″=722.56 sq. in. | |||||
| Surface area of elbow (90° or ¼ of entire ring) 722.56 sq. in.÷4=180.64 sq. in. | |||||
| Ans. 180.64 sq. in. |
Problem 24A.—A 90° elbow to fit a rectangular pipe 7″×12″ has a 10½″ throat radius. What is its surface area?
Problem 24B.—A 60° elbow ( of the solid of revolution) to fit a rectangular pipe 30″×61″ has a throat radius of 17″. What is its surface area?
