Some are. Others aren't. In order to focus in on it more clearly,
I'd need to see the list of choices that you're looking at.
Chat with our AI personalities
The answer depends on what X and Y are.
Yes. If an angle of x degree is obtuse then x > 180 deg Suppose x = 180 + y where y is positive. Then x can be divided into two angles of 90+y/2 degrees each y>0 so 90 + y/2 > 90 and so the two angles are obtuse.
x=y is the identity. It is its own inverse. So the inverse is y=x.
X + Y⁶X + Y * Y * Y * Y * Y * Y
900 º If the three angles in the triangle are x, y, and z then: x + y + z = 180º The exterior angles are: (360 - x) + (360 - y) + (360 - z) = 360 + 360 + 360 - (x + y + z) = 360 + 360 + 360 - (180) = 900º