A 155 degree angle is an angle that measures 155 degrees. It falls between 90 and 180 degrees, which means it's an obtuse angle. So, if you're ever in a situation where you need to identify a 155 degree angle, now you know it's just a fancy way of saying "more than a right angle, but less than a straight angle."
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Oh, dude, a 155 degree angle is like when you have a straight line and then you just bend it a little bit, not quite halfway to making a full turn. It's like if you're trying to draw a circle but you get distracted and stop early. So yeah, it's an angle that's bigger than a right angle but not quite a complete turn.
all angles greater then 90o are called obtuse angle
25 degrees
The complement of a 55 degree angle is a 35 degree angle
A 12 degree angle is an acute angle.
Cos(-155) = cos(155) = 1 - cos(180-155) = 1-cos(25).