Answer:
C) 14 ft
Step-by-step explanation:
Let l be the length of ladder ,
The distance of ladder from the wall = 13 ft,
And, the height of wall = 5 ft,
Since, the length of ladder is minimum when the wall is straight,
In this condition,
\(l^2=(\text{The distance of ladder from the wall})^2+(\text{Height of wall})^2\)
\(\implies l^2=13^2+5^2\)
\(\implies l^2 = 169 + 25 = 194\)
\(\implies l=13.9283883\approx 14\)
Hence, the approximate minimum length of the ladder is 14 ft.
