CTET Class I to V 8 Feb 2026 Shift 2 Paper

Concept:The definitions of different types of angles: acute ($0^\circ < \theta < 90^\circ$), obtuse ($90^\circ < \theta < 180^\circ$), straight ($\theta = 180^\circ$), and reflex ($180^\circ < \theta < 360^\circ$).Explanation:We check each statement one by one:- Statement A: Two acute angles can sum to an obtuse angle. Example: $50^\circ + 60^\circ = 110^\circ$, which is obtuse. Correct.- Statement B: One acute and one obtuse angle can sum to a straight angle. Example: $60^\circ + 120^\circ = 180^\circ$. Correct.- Statement C: Reflex angle is between $180^\circ$ and $360^\circ$. This is the definition. Correct.- Statement D: Two acute angles can make a reflex angle. Maximum sum of two acute angles is just under $90^\circ + 90^\circ = 180^\circ$. Since a reflex angle must be greater than $180^\circ$, this sum can never reach the reflex range. Incorrect.Answer:Option D (Two acute angles can be put together to make a reflex angle) is the statement that is not correct. Hence the answer is (4).