The answer is: 1 km
If the size is small than 1km in diameter, the object would be classified as a a meteoroid, not an asteroid. Up until the year of 2018, NASA has spotted around 147,132 asteroids. From that number, around 8% of them had the risk of colliding with the earths.
(x+y)^2=56
x^2+2xy+y^2=56. we know that xy=12
so 2(xy)=24
x^2+24+y^2=56
x^2+y^2=56-24
x^2+y^2=32. <-------------
All the factors of 38 are 1, 2, 19, and 38.
The primes are 2 and 19.
The second largest prime factor is 2 .
