True or false the shortest distance from the center of the circumscribed circle to the sides of the inscribed triangle is the circle's radius

For how answer my question this will be the last question can you answer in math subject

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Can someone me out here and the tell me the greatest common factor