The area of the trapezoid with the middle line 12 and height 15 equal to 180
where a and b are bases, h is height
A trapezoid is a quadrilateral whose two sides are parallel (bases) and the other two are not parallel (sides).
Trapezoid area formula 
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 = h·m
=
12·15
=
180
Answer: the area of the trapezoid with the middle line 12 and height 15 equal to 180