a rope of which a calf is tied is increased from 16 m to 23 m , how much additional grassy ground shall it graze ?
"π ( 232 – 162 ) = 858 answer : e"
multiply(subtract(power(23, const_2), power(const_10, const_2)), divide(add(multiply(16, const_2), const_2), add(const_4, const_3)))