20ft, 12, b

What is the length of the missing leg? If necessary, round to the nearest tenth.
b=__ feet

1 answer

To find the length of the missing leg in a right triangle where one leg is 12 feet and the hypotenuse is 20 feet, we can use the Pythagorean theorem, which states:

\[ a^2 + b^2 = c^2 \]

Here, \(c\) is the length of the hypotenuse (20 feet), \(a\) is one leg (12 feet), and \(b\) is the missing leg.

Plugging in the known values:

\[ 12^2 + b^2 = 20^2 \]

Calculating the squares:

\[ 144 + b^2 = 400 \]

Now, subtract 144 from both sides:

\[ b^2 = 400 - 144 \]

\[ b^2 = 256 \]

Now take the square root of both sides to find \(b\):

\[ b = \sqrt{256} \]

\[ b = 16 \]

Thus, the length of the missing leg \(b\) is \(16\) feet.