how to find the area?

To find the answer, you would multiply each side, like 6.3 * 7.9 * 14.7, then you would HOPEFULY get the right answer, i hope that i explained things right and that this helps :D
It's just Base * Height / 2
A = 1/2 * B * h in formula form.
The base in this case deserves some comments.
Area = 1/2 base * height
base = 7.9
height = 6.3
Area = 1/2 * 7.9 * 6.3
Area = 24.885 in^2
If you are supposed to round then it would be 24.9 to 3 places.