The word “product” indicates multiplication and the symbol is “”.
The word “square of the radius r of the base” indicates “”.
Rewrite the sentence into expression as
The volume of the cone .
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”.![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=73d53e5503077f73ee0e26c2ea5b6082.png\")
”.![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step2.JPG\")
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![\"\"](\"/userfiles/image/Library/cone_pa75_p37.gif\")
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.