Top 10.13

Line Segment EF = ? provided Area Blue = Area Orange = Area Green.
Area ABC = ? provided Area BDF = 3.
Blue Fraction = ?
Line Segment BC = ? provided Area Green = Area Purple.
Angle ABC = ?
Area of Isosceles Triangle = ?
AB / BC = ? provided Area Orange = Area White.
a = ?, b = ?
Area ABFE = ?
Twelve Circles