Question

16cm 20cm f

Explanation:

Step1: Apply Pythagorean theorem

In a right - triangle, if the hypotenuse is $c$, and the two legs are $a$ and $b$, then $c^{2}=a^{2}+b^{2}$. Here, $c = 20$ cm, $a = 16$ cm, and we want to find $b$. So $b^{2}=c^{2}-a^{2}$.

Step2: Substitute values

$b^{2}=20^{2}-16^{2}=400 - 256=144$.

Step3: Solve for $b$

$b=\sqrt{144}=12$ cm.

Answer:

$12$ cm