The missing side of the triangle is 12ft .
Step-by-step explanation:
<h3> Given </h3>
First side = a = x
Second side = b = 9 ft
And third side = c = 15 ft
<h3>Solution :-</h3>
Pythagoras theorem
(Perpendicular) ²+(Base) ²= (hypotenuse) ²
<u>substitute the value</u>
➟ ( x ) ² + ( 9ft ) ² = ( 15 ft) ²
<u>Multiplying the values</u>
➟ x² + 81 ft ² = 225 ft ²
<u>subtract the values</u>
➟ x ² =225 ft ² - 81 ft²
➟ x ² = 144 ft²
<u>finding square root of 144 ft</u>
➟ x = √144 ft ²
➟ x = 12 ft
Hence , missing side of triangle is 12 ft .