straight angle
90o angle
The second angle? angle B?
An angle that measures 180 degrees is a straight angle, or straight line.Line.
180 degrees -- a straight angle
straight angle
a line
Straight line
The last major kind of angle is the straight angle. A straight angle is an angle that measures exactly 180 degrees.
You use the right angle next to an acute angle perhaps and you see that when a angle is closer together it is an acute angle and if it is spread apart or farther apart from a right angle it is an obtuse angle. If the angle is a straight line and doesn't look bent like a right angle it is a straight angle.
a 180 degree angle
Straight angle
That is a straight angle.
Acute
A straight angle is 180 degrees, or twice the measure of a right angle. Therefore, it looks like a right angle that has been folded out into a flat line. Another way is to look at the arch of a 180 degree angle as a semicircle. Connect both ends of the semicircle and you have a straight line.
A right angle
90o angle