Which of the following figured is not a polygon ?

What is the volume of this container?

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?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)