qjin27

16*8/2=64

https://www.desmos.com/calculator/4347euwrxr

2^2+1^2=5

each side of the square is $\sqrt5$. the area is 5

21+12+10+16=49

5*4*15=300

how did you get it

CPhill can you do something about him

this has been answered here

       https://web2.0calc.com/questions/rational-expressions-of-polynomials