Answer:
c=16.4924225024
Explanation:
Use Pythagorean Theorem:
a^2+b^2=c^2
The legs of the triangle are a and b, in this case 16 and 4. The hypotenuse is c, or the unknown in this problem.
16^2+4^2=c^2
256+16=c^2
272=c^2
Take the square root of both sides
c=16.4924225024
Hope this helps!