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Luas
= phi x r²
= 22/7 x 7 x 7
= 22 x 7
= 154 cm²
b)
Luas
= phi x r²
= 22/7 x 28 x 28
= 22 x 4 x 28
= 2.464 cm²
A. L= π. 7²
= 22/7 . 7. 7
= 22. 7
= 154 cm²
B. L= π. 28²
= 22/7. 28. 28
= 22. 112
=2464 cm²