Answer: b) straight
Step-by-step explanation:
Let's go through each option:
a) acute: An acute angle is an angle that measures less than 90°.
b) straight: A straight angle is an angle that measures exactly 180°. It forms a straight line.
c) right: A right angle is an angle that measures exactly 90°, forming a perfect L-shape.
d) obtuse: An obtuse angle is an angle that measures more than 90° but less than 180°.
So, the correct answer is b) straight because a 180° angle forms a straight line.
