Answer:
V = 628
Step-by-step explanation:
Formula to find volume(V) of cone:

Solution: The missing reason in Step 8 is substitution of
.
Explanation:
The given steps are used to prove the formula for law of cosines.
From step 5 it is noticed that our equation is
..... (1)
From step 7 it is noticed that the value of
is
.
So by substituting
for
in equation (1) we get the equation of step 8, i.e.,

Hence, the missing reason in Step 8 is substitution of
.
Answer:
2.8828283e+16
Step-by-step explanation:
I think it’s C. Sorry if I’m incorrect