These shapes are called right kites and they are in fact bicentric quadrilaterals (below to the left). Among all the bicentric quadrilaterals with a given two circle radii, the one with maximum area is a right kite. read more
The Kite Shape is usually introduced to your child in Kindergarten or First Grade. When this shape is introduced it usually coincides with the introduction of the rhombus. The reason for this is due to the similarities of the two. read more