Answer
$\frac{170}{9}\approx18.9^\circ C$
Work Step by Step
The formula is:
$C=(F-32)\times\frac{5}{9}$ where F is the Fahrenheit and C is Celsius.
Here:
$C=(66-32)\times\frac{5}{9}=\frac{34\times5}{9}=\frac{170}{9}\approx18.9^\circ C$
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