What is an angle which measures exactly \[{{180}^{o}}\] called?

1.	What is an angle which measures exactly \[{{180}^{o}}\] called?
A.	A zero angle
B.	A right angle
C.	A straight angle
D.	An acute angle
Answer» D. An acute angle

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What is an angle which measures exactly \[{{180}^{o}}\] called?

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