Question

Help me with this, it's Pythagorean theorem.

Answer 1

Step-by-step explanation:

Let x represent the missing side length.

By Pythagoras' Theorem,

We have x² + 12² = 13².

Therefore x² = 13² - 12² = 25 and x = 5.

(x = -5 is rejected as side lengths are positive)

Answer 2

Answer:

Let the required side of the triangle be x

By Pythagoras theorem we get,

$x = \sqrt{ {13}^{2} - {12}^{2} } \\ = \sqrt{169 - 144} \\ = \sqrt{25} \\ = \sqrt{ {5}^{2} } \\ = 5$

5 is the right answer.