The length of the unknown side is 16 meters
What is a right triangle?
A right triangle is a triangle that has one of its angles to be 90 degrees
The length of the unknown side is calculated using the following Pythagoras theorem.
[tex]20^2 = 12^2 +b^2[/tex]
Evaluate the exponents
[tex]400 = 144 +b^2[/tex]
Collect like terms
[tex]b^2 = 400 -144[/tex]
Evaluate the like terms
[tex]b^2 = 256[/tex]
Take the square root of both sides
[tex]b = 16[/tex]
Hence, the length of the unknown side is 16 meters
Read more about Pythagoras theorem at:
https://brainly.com/question/654982
