Geometry

Drawing some basic things about geometry, 1st) parallel lines, 2nd) perpendicular lines, 3rd) oblique lines, 4th) a right angle, an acute angle and an obtuse angle, 5th) a circle with its radius, its secant. 6th) a circle with its diameter and its central angle and its inscribed angle.

 

 

 

Then, draw a star-shaped polygon. Follow the steps: 

1st) draw a circle with a compass. Using the same compass measurement, put your compass at point A and mark points B and C. Then mark points D and E from F.

2nd) join points A, D and E with straight lines to make a triangle inside the circle. Then do the same with points B, C and F. Now you have a star-shaped polygon