Which of the following statements are true or false? Give reasons for your answer.

i) ‘Today is a bright day’ is an unambiguous statement.

ii) The sum of the interior angles of a Pentagon is 450o .

iii) Pre-operational thinking is the characteristic of a two year old child.

iv) If the capacity of a 3D-objects increases, then the volume also increases.

v) Each mathematical problem have a unique solution.

i) False. The statement "Today is a bright day" is not unambiguous because the concept of "bright" can vary depending on context, perception, and individual interpretation. What one person considers bright, another might not.

ii) False. The sum of the interior ______ ________ ____ __________ ________ __________ ____.
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