Simple Math!! 2581 ÷ 21

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

This is about circle theorems. someone asap : (

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120