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= 22/7 x 7 (7 + 2.15)
= 22 ( 7 + 30)
= 22 x 37
= 814
L. 1/2 lingkaran = 1/2 π x r x r
= 1/2 x 22/7 x 7 x 7
= 11 x 7
= 77