$\"\"$

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

$\"\"$

Volume of the cone is $\"\"$ . $\"\"$ $\"\"$

$\"\"$ (Substitute r= 10 and h=30)

$\"\"$ (Evaluate power: $\"\"$ )

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Divide: $\"\"$ ) $\"\"$

Volume of the cone $\"\"$ .