Question

CAN SOMEONE PLEASEEEE ANSERR THISSSSSSSS THANK YOU SO VERY MUCH

Answer 1

Use Pythagorean theorem.

Let x be the side we are looking to determine:

$x = \sqrt{20^2-8^2}=\sqrt{336}\approx 18.3$

the missing measure is approximately 18.3 units

Answer 2

Pyth. theorem
$\sqrt{20 { }^{2} - 8 {}^{2} }$

=18.33
=18.3 (corr. to the nearest tenth)