jari-jari sebuah lingkaran adalah 28 cm Tentukan a diameter lingkaran b luas lingkaran C keliling lingkaran
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r = 28 cm
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a. diameter lingkaran
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d = 2 × r
d = 2 × 28
d = 56 cm
b. Luas lingkaran
L = 2.464 cm² . [Cara terlampir]
c. Keliling lingkaran
K = 176 cm . [Cara terlampir]
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d = 2 × r
d = 2 × 28
d = 56
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L = phi × r^2
L = 22/7 × 28^2
L = 22/7 × 784
L = 2.464
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K = 2 × phi × r
K = 2 × 22/7 × 28
K = 2 × 88
K = 176
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[answer.2.content]
