001_Octagon


001a_title_Math


002_90 Degree Angle (Mars)


003_Rhomboid


003b_Equilateral Tr#12BF54C


004_A=4x, 4(A=2(x+y))tif


005_sine curve (saturn)


006_Rhombus


007_+x+x


008_6 semi-circles #12BFE13


009_y=y+1


010_A=B=C=D=90 (Saturn)


011_four parallel l#12BFC01


012_X+Y=0(Callisto)


013_Riemann curved space


014_A=pir2 (Mercury)


015_French Curve (Ganymede)