$\"\"$

The sentence is the circumference “ $\"\"$ ” of a circle equals the product of 2,

$\"\"$ and the radius “ $\"\"$ ”.

The word “equals” can be represented as “ $\"\"$ ” symbol.

The word “product” indicates multiplication and the symbol is “ $\"\"$ ” . $\"\"$

Rewrite the sentence into expression as

$\"\"$ $\"\"$

The equation is $\"\"$ .