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Value of π is _________ approximately.

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Ratio of the circumference of a circle to its diameter is denoted by symbol ________.

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If area of a triangular piece of cardboard is 90 cm², then the length of altitude corresponding to 20 cm long base is _________cm.

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Circumference ‘C’ of a circle can be found by multiplying diameter ‘d’ with ________.

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Circumference ‘C’ of a circle is equal to 2 ×_________.