Trapezoid area with sides 2.13,2.46,3.5,4.22 equal to NAN
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)
=
2.13+2.46
2
·
√3.52 - ()2
(2.46-2.13)2+3.52-4.222
2·(2.46-2.13)
=
4.59
2
·
√3.52 - ()2
0.332+3.52-4.222
2·0.33
=
4.59
2
·
√12.25 - ()2
0.1089+12.25-17.8084
0.66
= 2.295
·
√12.25 - ()2
-5.4495
0.66
= 2.295
·
√12.25 - -8.2572
= 2.295
·
√12.25 - 68.178049
= 2.295
·
√-55.928049
= 2.295
·
NAN
=
NAN
Answer: trapezoid area with sides 2.13,2.46,3.5,4.22 equal to NAN