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= 36 - 1/4 * 36 * [phi]
= 36 - 9 * 3,14
= 36 - 28, 26
= - 7,74 D
28. Sama dengan keliling 1 lingkaran
-> 22/7 * 14
= 44 B
= (s x s) - (1/4 x phi x r x r)
= 6 x 6 - 1/4 x 3,14 x 6 x 6
= 36 - 28,16
= 7,74 (d)
28) K = (K persegi) - (K 1 lingkaran)
= (4 x S) - ( phi x D)
= 4 x 14 - 22/7 x 14
= 176 - 44
= 132. (d)