^@ABCD^@ is a square with each side measuring ^@16 \space cm^@. ^@M^@ is a point on ^@CB^@ such that ^@CM = 4 \space cm^@. If ^@N^@ is a variable point on the diagonal ^@DB^@, find the least value of ^@CN + MN^@.
The sides of a quadrilateral, taken in order are ^@ 14 \space cm, 13 \space cm, 12 \space cm,^@ and ^@9 \space cm^@ respectively. The angle contained by the last two sides is a right angle. Find the area of the quadrilateral.