You can use Pythagorean theorem to solve
10 squared + 3 squared = x squared
100+9=x squared
109=x squared
square route 109 and x to get
10.44=x
Answer:
volume 1050 
surface area 859 
Step-by-step explanation:
volume is length times width times height (7*25*12)/2
surface area is area of all the sides added together
2(25*12)+(12*7)+ 2(
)
You use a closed dot with the greater than or less than with the line under the symbol or the greater than or equal to or the less than or equal to symbols. The line indicates a closed dot.