Answer:
3cm, is correct.
use the surface area formula
Step-by-step explanation:
There's no answer here. Because -6<21.
9
9v = 9(2i + 9j) = 18i + 81j
|9v | = = = 9
x=6
Hypotenuse is 10 because it is the opposite of the right angle
8^2+x^2=10^2
64+x^2=100
x^2=36