Trapezoid area with bases 10,5 and height 6 equal to 45
A trapezoid is a quadrilateral whose two sides are parallel (bases) and the other two are not parallel (sides).
Trapezoid area formula 
where a and b are bases, h is height
where m is the middle line, h is the height
where d1,d2 are diagonals, α° is the angle between them
where a and b are the bases, c and d are the sides
where r is the radius of the inscribed circle, α° is the angle between the base and the sideSolution:
S =
(a+b)·h
2
=
(10+5)·6
2
=
15·6
2
=
90
2
=
45
Answer: the area of a trapezoid with bases 10,5 and height 6 equal to 45