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r = 3
Keliling
= 2 × pi × r
= 2 × 3.14 × 3
= 6.28 × 3
= 18.84
lingkaran 2
r = 1
keliling
= 2 × pi × r
= 2 × 3.14 ×1
= 6.28
perbandingan keliling
18.84 : 6.28 ( dibagi 6.28)
3:1
b. lingkaran 1
r = 3
luas
= pi × r"
= 3.14 × 3"
= 3.14 × 9
= 28.26
lingkaran 2
r = 1
luas
= pi × r"
= 3.14 × 1"
= 3.14 × 1
= 3.14
perbandingan luasnya
28.26 : 3.14 (dibagi 3.14)
9:1
semoga membantu :)
#jadikan menjadi jawaban terbaik:)