7. PR * QS = PQ * QR
10 * QS = 6 * 8
QS = 4,8 cm (C)
8. pi * r^2 = 256 pi
r^2 = 256
r = 16
d = 32
pi * d = pi * 32 = 32 pi (D)
9. pi * r^2 = 314
pi * (3r)^2 = pi * 9r^2
314 * 9 = 2826 (B)
poin doang uang ngga :(
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7. PR * QS = PQ * QR
10 * QS = 6 * 8
QS = 4,8 cm (C)
8. pi * r^2 = 256 pi
r^2 = 256
r = 16
d = 32
pi * d = pi * 32 = 32 pi (D)
9. pi * r^2 = 314
pi * (3r)^2 = pi * 9r^2
314 * 9 = 2826 (B)
poin doang uang ngga :(