Answer:
D.) 16^2 + 63^2 = x^2
Explanation:
The Pythagorean Theorem supports my answer. When given a right angled triangle, the equation a^2+b^2=c^2 should be used to find the missing variable/angle. In this case, when substituting the numbers in the variables, you are left with the correct answer D.
I hope this helped!!
~Penny