Use the formula for the area of a parallelogram.
The height of a parallelogram is the perpendicular distance between either of the two sets of parallel sides.
So, the height is 3 cm, not 3.1 cm.

Area	=	bh
	=	(6.5 cm)(3 cm)
	=	19.5 cm2

Use the formula for the area of a trapezoid.
The bases are the sides which are parallel.
The height is the perpendicular distance between the bases.

Area	=	$\frac{1}{2}$(b1 + b2)h
	=	$\frac{1}{2}$(5.8 cm + 6.6 cm)(3 cm)
	=	$\frac{1}{2}$(12.4 cm)(3 cm)
	=	$\frac{1}{2}$(37.2 cm2)
	=	18.6 cm2