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s² - πr²
14² - (22/7 x 7²)
196 - (22/7 x 49)
196 - 154
42
maka luasnya = 42 cm²
= 196cm [pangkat2]
L2 = 22/7 x 7cm x 7cm
= 22 x 7 cm
= 154 cm [pangkat2]
L1 - L2 = 196 cm [pangkat2] - 154 cm [pangkat2]
= 42 cm [ pangkat 2]