Trapezoid area with sides 0.54,3,4.83,5.57 equal to 8.528
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
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 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
2
·
√c2 - ()2
(b-a)2+c2-d2
2·(b-a)
=
0.54+3
2
·
√4.832 - ()2
(3-0.54)2+4.832-5.572
2·(3-0.54)
=
3.54
2
·
√4.832 - ()2
2.462+4.832-5.572
2·2.46
=
3.54
2
·
√23.3289 - ()2
6.0516+23.3289-31.0249
4.92
= 1.77
·
√23.3289 - ()2
-1.6444
4.92
= 1.77
·
√23.3289 - -0.3342
= 1.77
·
√23.3289 - 0.111556
= 1.77
·
√23.217344
= 1.77
·
4.818
=
8.528
Answer: trapezoid area with sides 0.54,3,4.83,5.57 equal to 8.528