STEP 1: find side $ x $
To find side $ x $ use formula:
$$ x = \frac{ a - b } { 2 } $$After substituting $ a = 26 $ and $ b = 8 $ we have:
$$ x = \frac{ 26 - 8 } { 2 } $$ $$ x = \frac{ 18 } { 2 } $$ $$ x = 9 $$STEP 2: find side $ c $
To find side $ c $ use Pythagorean Theorem:
$$ h^2 + x^2 = c^2 $$After substituting $ h = 9 $ and $ x = 9 $ we have:
$$ 9^2 + 9^2 = c^2 $$ $$ 81 + 81 = c^2 $$ $$ c^2 = 162 $$ $$ c = \sqrt{ 162 } $$$$ c = 9 \sqrt{ 2 } $$