The length of AD would be = 27.
How to calculate the missing length of the given triangle?
To calculate the missing length of the given triangle, the following steps should be taken as follows:
Given that;
Line BC(b) = 13
Line DC(c) = 30
Using hypotheses formula;
c² = a²+b²
30² = a²+13²
a² = 30²-13²
= 900-169
= √731
a = 27.