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diameter = 12,5 / 3,14
diameter = 4 cm
jari-jari = 2cm
Luas lingkaran = phi x 2 x 2
3,14 x 4 = 12,56 cm^2
jawabannya C
Nomor 2
diameter = 28 cm
jari-jari = 14 cm
Luas lingkaran = phi x r x r
22/7 x 14 x 14
Luas lingkaran = 616 cm^2
jawabannya C
12,5 = 2 x 3,14 x r
r = 12,5 / 6,68
r = 1,99
maka :
L = π x r²
= 3,14 x 1,99²
= 12,56 cm² ( C)
2. dimeter = 28
L = π x r²
= 22/7 X 14²
= 616 cm² (C)