Can y'all solve these for me and show me how you did it not just the answer

1. it is a right triangle so to find WX (hypotenuse) use Pythagorean theorem 
x=√(10.5²+12.3²)=16.2
Answer is H
2.correct answer is A,
half of rectangle is right triangle, where a and b is legs and c is hypotenuse , so you can use Pythagorean theorem, and get
c²=a²+b²

Step-by-step explanation:

area of a circle =πr²

where r=radius and π=pi

circumference=2πr

or πd

where d= diameter