Listen to the lecture about geometry and say:
1) What is a postulate? 2) What is the difference between an axiom and a postulate? 3) How many Euclid's postulates does the lecturer speak about? 4) How is a circle defined? 5) How many degrees does a right angle contain? 6) What simple closed figures have all right angles? 7) What postulate is missed in the film? 8) Surf the Internet, find information and give its definition, please/