In the triangle shown below what is the approximate value of x

Answer:
The correct answer is b) 20.78
Step-by-step explanation:
To find this, use the Pythagorean Theorem. Use 12 as the first leg, x as the second and 24 as the hypotenuse.
a^2 + b^2 = c^2
12^2 + b^2 = 24^2
144 + b^2 = 576
b^2 = 432
b = 20.78