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''Plane geometry is about shapes that can be drawn on a piece of paper. Let me introduce you some basic shapes.'' 
TRIANGLES
''This is equilatera triangle. lt has three equal sides and three equal angles.'' 
''This is isosceles triangle. It has two qual sides and two equal angles.'' 
''The third one is called scalene triangle. It has no equal sides or angles.'' 
CIRCLE
''Try to draw a circle like that with your bare hands.'' 
SQUARE
RECTANGLE
''What is the main difference between squares and rectangles?''