We want to find the missing side lenght of the triangle.
We have that:
By the Pythagoras Theorem we know that
side 1² + side 2² = hypotenuse²
since side 1 = 9
side 2 = 14
and
hypotenuse = x, then
side 1² + side 2² = hypotenuse²
↓
9² + 14² = hypotenuse²
↓
81 + 196 = hypotenuse²
277 = hypotenuse²
Then
hypotenuse = √277
≅ 16.64
Answer: the missing side of the right triangle is √277≅ 16.64
