= πr²
= 22/7 × 21²
= 22/7 × 441
= 9.702/7
= 1.386 cm²
@BeruangGemoy :•
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= πr²
= 22/7 × 21²
= 22/7 × 441
= 9.702/7
= 1.386 cm²
@BeruangGemoy :•