Find the area of the portion of the surface 
that lies above the triangular region with vertices 
, and 
.
Definitions:
Fantasy Stage
A period in child development where imagination and make-believe play are prevalent, allowing for exploration of identity and experience.
Career Development
The continuous journey of controlling education, employment, leisure activities, and changes with the aim of progressing towards a self-directed and continuously developing ideal future.
Donald Super
An influential psychologist known for his theories on career development and the role of self-concept in vocational choice.
Intrinsic Motives
The drive to engage in activities for their own sake, for the enjoyment or challenge they provide, rather than for some external reward.
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