# SOLUTION: if the cost for materials to make a circular metal disk 3 cm in diameter is \$.15, what would be the cost for materials to make a disk of the same thickness but 6 cm in diameter?

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Geometry -> SOLUTION: if the cost for materials to make a circular metal disk 3 cm in diameter is \$.15, what would be the cost for materials to make a disk of the same thickness but 6 cm in diameter?       Log On

 Ad: Over 600 Algebra Word Problems at edhelper.com Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Word Problems: Geometry Solvers Lessons Answers archive Quiz In Depth

 Question 330573: if the cost for materials to make a circular metal disk 3 cm in diameter is \$.15, what would be the cost for materials to make a disk of the same thickness but 6 cm in diameter? would the answer be \$.45? Thanks. Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!The assumption is that the cost of materials is based on the area of the disk (since the thickness is equivalent). , where is total cost, is cost per unit area, is area. The area of a circle is, From the first example, The area for the second disk is, Since A2 is 4 times as much as A1, then the total cost will be 4 times as much. . . . \$0.60