Answer:
4 x 20 - X
Step-by-step explanation:
4 times 20 - X
x is the unknown variable
Unknown variable = what you are trying to find.
No not rational because you cant divide it
there is no length in a circle
We can check this by seeing if Pythagorean's theorem applies. The longest side is the hypotenuse, so let's see if this is true:


This is, indeed correct, thus, this
<em>is </em><em>
a right triangle.</em>
I’m not sure about number 1 but the answer for number 2 is
-4 1/2, -4.2, -4, ,0, 4