An obtuse angle measures 180 degrees.
always
sometimes
never

Never                                  

Step-by-step explanation:

Definition of Obtuse angle :

An angle whose measure is greater than 90 degree and less than 180 degree.

In other words, Obtuse angle is lies between 90 degree to 180 degree.

Here note that, it is not equal to 90 degree and 180 degree.

Because if angle = 90 degree it is "Right angle'

If angle = 180 degree it is 'Straight Angle'

So, Obtuse angle measure never 180 degree.

50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.

d. vertex

step-by-step explanation: