Mathematics for IGCSE & O level - Using A Calculator (Section 2 - No. 17)

What is the formula used to find area?

$$ A = 4pi r^2 $$

$$ A = r^2 $$

$$ A = 2pi r $$

None of the above

Giải thích

The formula is $$ A = 4pi r^2 $$.

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