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L = πr²
L = 22/7 × 7/2 ×7/2
L = 77/2
b)
L = 38,5
L = 2(22/7 × 3,5/2 ×3,5/2)
L = 2 × 9,625
L = 19,25
Ltotal = 38,5 + 19,25 = 57,75
d)
Lpersegi = 7² = 49
Llingkaran = 38,5
49 - 38,5 = 10,5
maaf kalo salah.
yang C kurang jelas soalnya