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tdk dapat dihitung krn panjang sisi persegi tdk ada
no 7)
phi . r^2 = 144 phi
r^2 = 144
r = V144
r = 12
no 8)
luas lingkaran 1 : luas lingkaran 2
phi , 1^2 : phi . 2^2
1 : 4
no 9)
PB AB = 72/360 x 3,14 x 2 x 10
= 12,56
no 10)
90/360 x 22/7 x 14 x 14 = 154
no 11)
80/360 x 22/7 x 2 x 21 = 29,3
no 12)
45/360 x 22/7 x 56 = 22