For two lines to be perpendicular, the lines must intersect such that the angle formed by their intersection is exactly___degrees

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

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

We just started the introduction into circles and i have no idea how to do this.