Question

which angle is an acute angle?
∠doe
∠coe
∠cod
∠aod

Explanation:

An acute angle is an angle that measures greater than 0° and less than 90°.

• $\angle DOE$: This is formed by a horizontal and vertical line, so it is a right angle (90°), not acute.
• $\angle COE$: This angle is between a horizontal ray and a ray pointing upward-right, and it is clearly smaller than 90°, so it is acute.
• $\angle COD$: This angle spans from a rightward horizontal ray to a downward vertical ray, making it an obtuse angle (greater than 90°).
• $\angle AOD$: This angle spans from a leftward horizontal ray to a downward vertical ray, making it an obtuse angle (greater than 90°).

Answer:

$\angle COE$