Respuesta :

Answer:

D straight angle

Step-by-step explanation:

An angle which measures exactly 180 degrees is called a 'straight angle.

Answer:

D. A straight angle.

Step-by-step explanation:

An acute angle is an angle that is less than 180°, and obtuse angle is an angle that is greater than 180°. A right angle is 90°. A straight angle is equal to 180°. I hope this helps and please mark me brainliest!