Answer
$100^{\circ}~C$
Work Step by Step
$C = \frac{5}{9}(F-32)$
We can use this formula to convert from Fahrenheit to Celsius. It is given in the question that $F = 212$ since the temperature on the Fahrenheit scale is $212^{\circ}~F$.
$C = \frac{5}{9}(F-32)$
$C = \frac{5}{9}(212-32)$
$C = \frac{5}{9}(180)$
$C = 100$
The temperature on the Celsius scale is $100^{\circ}~C$