First, consider the Pythagorean rule:
small side ² + other side ² = hypotenuse²
a² + b² = c²
So in this case, to find the length of side b, follow the rule and calculate like so:
b²= c²- a²
b²= 24² - 12²
b²= 432
b = √423
b = 6√3 AKA 20.78
Therefore the correct answer is d).
Hope this helps!
