Answer:
i do not know
Step-by-step explanation:
Any other irrational number. 0.4 is rational (ie., it can be written as a fraction), but rational+irrational is always irrational.
So examples would be π or √2. If you add those, the result is irrational.
Vertical angles are always equal.
x = 130
That's your answer.
Have an awesome day! :)
Imagine a right triangle where a and b are the legs and c is the hypothenuse.
Pitagora: a²+b²=c²
Divide by c
(a/c)²+(b/c)²=1
But a/c=sin(B) and b/c=cos(B)
Thus sin² + cos² = 1