As, Opposite side of Special trapezoid is equal.So, it will be a Parallelogram.
ab=c d= 19 units
Height of Trapezoid = 14 units
Area of Trapezoid = 
So, Area of Trapezoid = 266 square units
You, can use the formula for finding the area of parallelogram,which is = Base on which perpendicular is drawn × Length of Altitude
= 19 × 14
= 266 square units
If treasure is midway of two points then treasures point is(x1+x2/2,y1+y2/2)
16+3/2, 21+2/2
Else any point shown byyour options is treasure's point
I’m assuming you mean to round to the nearest tenth? If so, it’s 79.3. If that’s not what you’re asking i don’t know what else you mean